Ask MetaFilter questions tagged with algebra
http://ask.metafilter.com/tags/algebra
Questions tagged with 'algebra' at Ask MetaFilter.Tue, 01 Sep 2015 05:46:22 -0800Tue, 01 Sep 2015 05:46:22 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Please recommend your best resources for learning algebra.
http://ask.metafilter.com/285148/Please%2Drecommend%2Dyour%2Dbest%2Dresources%2Dfor%2Dlearning%2Dalgebra
My son is in grade 9 and is struggling with maths (this is an ongoing thing). Algebra is everywhere and he has no idea. What are the best online resources for stepping through algebra from the very beginning?tag:ask.metafilter.com,2015:site.285148Tue, 01 Sep 2015 05:46:22 -0800h00pyTyper Shark for Algebra?
http://ask.metafilter.com/284894/Typer%2DShark%2Dfor%2DAlgebra
I want to take a pre-calculus class, but I’m not prepared.
I would find it easier to prepare with some kind of program or system to refresh my math skills and learn some of what I missed in high school. I, like most mammals, am motivated by immediate rewards. Is there an online game where the math gets progressively harder and you earn rewards for completing problem sets? I was more willing to practice typing when I was defeating sharks than when I worked from a book. Does such a gamified system exist for math? I have a bachelor’s degree in International Relations, which I managed to obtain without taking much real math. I’m now trying to position myself to make a career change into a science-based field, and the linchpin in getting to my other prerequisites is taking pre-calculus, but since I only took statistics and formal logic in college, I need to place into pre-calculus (or take some lower level prerequisites). <br>
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More than 18 months ago, I said I was going to do some independent studying to get myself up to speed to place into pre-calc. I did really well for about six weeks, then totally lost momentum. I've heard of Khan Academy - though I admit I haven't spent any time on there - and I have Saxon’s Algebra I and Algebra II books. I made it about ⅓ of the way into Algebra I, but haven’t touched it since May 2014.<br>
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I’d also love to hear from others who, like me, needed to bulk up your math skills in your late twenties/early thirties. What worked for you? Am I best off just signing up for the lower level algebra course I’m likely to place into now, knowing I’ll then be ready for pre-calc in a couple of quarters? In a related topic, I'm also willing to hear advice for maintaining motivation on a long-term project you want to complete but are having trouble staying focused on.<br>
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Some similarities to <a href="http://ask.metafilter.com/113970/Math-basics-need-be-strengthening">this</a> question, though I’m starting from a much lower level, and maybe some to <a href="http://ask.metafilter.com/187878/If-an-geeky-child-is-traveling-South-at-839-MPH-and-his-nerdy-dad-is-going-North-at">this</a> one, though I'm pretty focused on algebra and these answers appear more scattershot.tag:ask.metafilter.com,2015:site.284894Tue, 25 Aug 2015 22:59:05 -0800CatenationHow to Math
http://ask.metafilter.com/284341/How%2Dto%2DMath
I'm a computer science major in college. I'm not a freakin' genius, but I do well-- get A's in my classes, good with abstraction (e.g. pointers), etc. However, I seem to have missed... my entire high school pre-Calculus math curriculum? I don't know. I've never gotten less than an A in a math class, but mathematical notation and reasoning just do not stick with me. I can't really explain it, but I'm good at tests, not so good at creative mathematical thinking. Would do poorly on the Putnam. It's a huge hole in my self-esteem and I really want to change this. <br>
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Tiny example: During a programming class, an instructor scribbles down a formula involving factorials. I stare at the board and try to remember how factorials work, even though I aced my Honors Analysis course (which was mostly proof writing). It's like I have to learn everything from first principles to remember any of it.<br>
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Further examples are hard to come by as it mostly relates precisely to things I can't remember or explain. I've never taken a class on probability and subsequently I absolutely hate it, because it seems like mostly arcane formulae and non-intuitive reasoning about weird, hypothetical events. Combinatorics is another important field that I suck at. I wouldn't say I'm super skilled at Calculus, but I had very little trouble in my Calc class since by the time I took Calc I was actively interested in math and soaked it up better, and the principles of real numbers are familiar. (I have a feeling most of this lack of proficiency comes from not being a natural math whiz and having a rather poor high school math/science education. I'm self-taught at most things, but math wasn't my focus or main talent in high school.)<br>
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I recently took the GRE and studied a lot (well, moderately-a lot) for the math section and did not do all that stellar (78th percentile). Sad! But it highlighted my weaknesses-- data analysis is easy but sometimes I go too fast and make dumb errors, I have no fucking idea how probability/combinatorics work, even ALGEBRA eludes my slippery grasp when I'm making dumb leaps of logic. <br>
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Is there just like, a GREAT book for hammering down these kinds of concepts that I should obviously have under my belt by now? I know what it feels like to be the smart kid in the class-- not necessarily the superior intellect but the one that just has the hang of things-- and I want to be that, now, for math. Pretty soon I'm going to be facing more discrete math and algorithms classes and I want to be better prepared.<br>
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Note: Also coming in to play is the fact that I'm female and so I constantly have this voice in the back of my head saying "why are you such a STUPID GIRL why are you such a MATH IS HARD BARBIE DOLL" and it's driving me crazytag:ask.metafilter.com,2015:site.284341Fri, 14 Aug 2015 07:10:47 -0800AnonymousBooks/review of high school math for former math major, current tutor
http://ask.metafilter.com/276837/Books%2Dreview%2Dof%2Dhigh%2Dschool%2Dmath%2Dfor%2Dformer%2Dmath%2Dmajor%2Dcurrent%2Dtutor
I need book recommendations two categories:
1) for myself for review (that are somewhere between high school text books and Spark notes)
2) just straight up textbooks for high school math (algebra i, geometry, algebra ii, trigonometry, pre-calculus) Hello! <br>
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Currently I tutor one student in Algebra ii. Although i have been able to eke it out, i would like a more comprehensive review of maths so i can do a better job. Part of the problem is my student doesnt have a text book and the teacher seems to randomly wander around in the algebra ii world. Another part of the problem is it has been many years since i have done math. The sad thing is, even though i have my undergraduate degree in math, so i really should be able to connect things better than i currently am, my brain has swiss-cheesed its math knowledge. I really like tutoring and i really like math, so i would like to tutor more. To do this, I need to do some serious review. I have been trying to do this, but i have run into a few problems:<br>
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Regarding review books:<br>
As i said, I need something between the high school textbooks and Spark notes. I really wish Spark notes were enough, but my brain apparently needs more help re-connecting concepts than those provide. I have gone to bookstores to check out their review books (___ for dummies, barrons, etc) for my student, and they seemed a little too long-winded for me (although if you guys recommend them, i will give them another shot)! I know it is whiny, but i get super bored trying to get myself to read about all this math targeted to current struggling high school students. I have tried to force myself to read, say, Barrons, but my brain revolts. I hope that makes sense.. Truthfully, i do not know exactly what i need/want, which i think is part of the problem. I can only really afford to buy one review book for each subject otherwise i would just buy a few books at barnes and noble and see which one works best (and I _have_ checked libraries and thrift stores and used bookstores for review books).<br>
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Regarding textbooks:<br>
I would really like to get one textbook of each subject, so i can see at what pace they teach concepts, have access to appropriate level problems, etc. I have checked many libraries, goodwills, salvation armies, misc thrift stores, the strand, and misc used bookstores and found 0 textbooks for my hours of looking. I know i can order them online through like amazon or a used textbook site, but the problem there is i dont know which books are good/bad and i dont want to have to buy a few books of each subject to find ones i am happy with. <br>
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On a side note, my brain has a really bad filter as to what things are more important than other things (i have add), which is why the seemingly easy task of choosing books is for difficult to me. Also, if you guys have any random advice you would like to impart to me, please feel free! Thank you guys for any help you provide and i hope this all made sense.tag:ask.metafilter.com,2015:site.276837Thu, 05 Mar 2015 15:31:15 -0800miss so and soBest cargo cult symbolic equation editor?
http://ask.metafilter.com/270171/Best%2Dcargo%2Dcult%2Dsymbolic%2Dequation%2Deditor
You're an armchair scientist and you like reading scientific papers. A lot of the fun ones include a lot of equations. You'd like to be able to recreate those equations in a virtual blackboard. You'd select terms and be able to replace them with a library of previous equations you've made. The blackboard would enforce whatever symbolic manipulation rules are required to maintain consistency (because you sure won't be able to). If you replace a term with a number or a data input, it does the calculations necessary to display properly. What is it? The best tool for this will be able to do literally everything visually with the symbols, i.e., no text-based programming language required to use the features described here.tag:ask.metafilter.com,2014:site.270171Sat, 18 Oct 2014 07:08:30 -0800bigbigdogVicarious Math Pressure
http://ask.metafilter.com/269824/Vicarious%2DMath%2DPressure
My eldest child is starting high school. She is in the most advanced math class (a version of geometry) offered by her fairly demanding high school. But my eldest is struggling during the review of algebra -- rate problems, word problems, etc. Concerned because math is cumulative, and I don't want her falling behind. What can I do to help, both with math and with preventing her from becoming discouraged? My daughter is very intelligent. She tested into her advanced math class, and she has never received grades that were anything less than As. Now she's struggling a bit, though, and I would like to help her turn it around. I plan to have her speak to her teacher for his suggestions on how to improve her understanding and performance. If that fails, then I might try to find her a tutor, too, but it would be great to get the hive's thoughts on resources, books, programs, plans, or even just advice about how to help a 14 year-old girl through math that is more challenging than she has faced before. <br>
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Advice I may be considering internally but that I don't really need here: take her out of the advanced math; don't worry about math because it's not that important. Advice that would be wonderful: when I was a 14 year-old (or when I was parenting my 14 year-old) there was a similar problem that I solved by doing X, Y, and Z. Thanks so much.tag:ask.metafilter.com,2014:site.269824Fri, 10 Oct 2014 23:41:43 -0800Slap Factory4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100.
http://ask.metafilter.com/265560/4xy2z100%2Dxy%2Dyz%2Dxyzj%2D3xzk%2Djk%2Djk100
4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100. WolframAlpha can only give me alternative forms or a solution involving 'real and imaginary parts of z'. Is there a solution I can count on my fingers? I wish to buy a thing. The thing I buy will have two desirable characteristics: j, and k.<br>
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j comprises three sub-characteristics, while k comprises four sub-characteristics.<br>
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I have three levels for ranking how important these sub-characteristics are to me - let's say 'super important', 'kinda important' and 'meh, whatever'. Obviously, they are of decreasing importance.<br>
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I have rated the three sub-characteristics for j 'super important', 'kinda important' and 'meh, whatever'.<br>
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I have rated three of the four sub-characteristics for k 'super important', and the fourth 'meh, whatever'.<br>
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This means I have a total of four 'super important', one 'important', and two 'meh, whatevers'.<br>
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Finally, j is a little bit more important to me than k. If further defining these variables help, then I think they'd be about a 60/40 split, though I'm flexible. They can be equal if that helps. At this stage I'd settle for k being less than j if it means a solution pops out.<br>
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I would like to assign positive numbers to x, y and z, because I'm a bureaucrat, that's why.<br>
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So, <br>
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x>y (must)<br>
y>z (must)<br>
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j = x + y + z<br>
k = 3x + z<br>
4x + y + z = 100 (per cent)<br>
j + k = 100 (per cent)<br>
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I can't change the number of characteristics, sub-characteristics, or levels of importance. <br>
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I could make k=2x+y+z, and so change the overall equation to 3x+2y+2z, but I'm not smart enough to know if that helps. It didn't help WolframAlpha.</j>tag:ask.metafilter.com,2014:site.265560Tue, 22 Jul 2014 18:07:45 -0800obiwanwasabiWhere to get algebraic help?
http://ask.metafilter.com/263754/Where%2Dto%2Dget%2Dalgebraic%2Dhelp
I am working through the <a href="https://mooculus.osu.edu/">mooculus calculus one mooc</a> as a refresher (which I clearly need), and there is one thing I have run across that I just don't see. Can you help me figure out what is going on, and what I can do to work out future problems? <a href="http://www.youtube.com/watch?v=daKVqDF8hng&t=7m0s">In the video on Inverses of Functions, at about 7:00</a>, the professor simplifies:<br>
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(6 +/- sqrt(6^2 - 4(-12 + h/5))/2<br>
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to<br>
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3 +/- sqrt(9 + 12 -h/5)<br>
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and I just can't see how that is done. What is confusing me is the term "+12 - h/5" in the simplified square root. It seems to be off by a factor of two, since the -4/2 = -2, not -1. What am I missing in this case?<br>
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In addition, I am going to be working through this over the next weeks and have no doubt I will run into similar problems. Is there a website or software that will perform this type of simplification and show the steps? I have access to Matlab and Mathematica, but have never used them, if they help.tag:ask.metafilter.com,2014:site.263754Tue, 17 Jun 2014 20:01:42 -0800carpographerPhysics Study Guide
http://ask.metafilter.com/253735/Physics%2DStudy%2DGuide
For my pal...What is a good physics study guide for:
a) 1st semester algebra-based college physics
b) lots of solved problems
c) <i>without calculus</i>.
I remember liking Schaum's in undergrad, but I seem to recall it being calculus based.
Thx Hive!tag:ask.metafilter.com,2013:site.253735Sun, 15 Dec 2013 14:02:36 -0800j_curiouserBasic Math for Math Majors
http://ask.metafilter.com/251889/Basic%2DMath%2Dfor%2DMath%2DMajors
Hello! I'm a first semester grad student in applied math. I am a non-traditional student in a variety of ways (liberal arts undergrad, working full-time), and while I'm finding that I <em>intellectually</em> understand the concepts I'm learning, execution is being made difficult by my lack of fluency with algebraic manipulation and calculus. So, here's an excellent example. In a problem set this week, we were asked to find the expected value of <a href="http://imgur.com/LrnTDdQ">this god-awful density function</a>. (We had to integrate over 0-inf, solve for the constant <em>c</em>, then do another integration to find E(V).) (it's 2/(sqrt(pi)*sqrt(lambda)), if anyone cares).<br>
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This, no joke, took me 4 hours. At times I found myself just completely frozen about what to do next. I understand stuff like u-substitution and integration by parts, I'm just mindnumbingly slow at it, and I end up psyching myself out. <br>
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I need to get better and more automatic with this stuff ASAP. What's the best way to do that, relatively quickly? Are there problem banks somewhere I can use? I have some old books, is going through them helpful? Is there a cool iphone game or something?tag:ask.metafilter.com,2013:site.251889Wed, 13 Nov 2013 14:08:48 -0800downing street memo8th grade math tutoring options?
http://ask.metafilter.com/246063/8th%2Dgrade%2Dmath%2Dtutoring%2Doptions
Where can we find low cost math tutoring for 8th grade algebra? I've tried some web searches, but have not had much luck. My niece has been having trouble with math - late last school year, I got her a tutor, and the tutor got her through the end of the year with math - hurray! However, the tutor was really expensive, and I'd prefer to not have to do that again! ($40-50/hour, I think.)<br>
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She's doing online school, and it's a different one (K12, as oppose to Connections). We'll definitely get in touch with the school to see if they have suggestions for tutoring - the last school was completely useless, and kept putting us off, until she almost failed. My mom is her primary caretaker, and cannot do math at that level. My husband and I cannot tutor her either. So family tutoring is out.<br>
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I did see care.com, and there are some tutors listed for less (mainly college students, which is fine!) but how do you know if they are good or not? <br>
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Any suggestions welcome. I hesitate to do online tutoring, because her classes are online, and I feel like she's missing something trying to learn her math that way.tag:ask.metafilter.com,2013:site.246063Mon, 05 Aug 2013 11:33:45 -0800needlegrrlScale my function for a line graph
http://ask.metafilter.com/242747/Scale%2Dmy%2Dfunction%2Dfor%2Da%2Dline%2Dgraph
Math-filter: I have a line chart in Google Docs that plots three columns of data over time. Data in the first two columns ranges from 0-1000, but data in the third column ranges from 3-9. I'd like to "scale" Line 3 (maybe this is the wrong word?) to be able to compare its value over the same graph space as Lines 1 and 2. I think what I need to do is create a new, "scaled" column and plot that as Line 3 instead. Thus, in this scaled column, I believe 9 unscaled would be the same as 1000 scaled, and 3 would be the same as 0. Since this is a spreadsheet, I need something in the form y=<em>f</em>(unscaled Column 3 value).<br>
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That's all I've got, though, after half an hour of trying to remember my algebra, and then another fifteen minutes playing with Wolfram Alpha. Am I on the right track here? What's the function to scale Line 3?tag:ask.metafilter.com,2013:site.242747Wed, 12 Jun 2013 07:23:15 -0800electric_counterpointAlgebra: exotic identity values?
http://ask.metafilter.com/238714/Algebra%2Dexotic%2Didentity%2Dvalues
[mathfilter] please give me some example algebraic structures that are not commutative, with exotic identity values. I am creating an inventory of example algebraic structures of one operator that feature associativity, commutativity, identity values and all combinations thereof. My table is nearly full but for three entries:<br>
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- non-associative, non-commutative with different left and right identities<br>
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- non-associative, non-commutative with both left and right identities, where both identities are equal<br>
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- associative, non-commutative, with either a left or right identity but not both<br>
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(For clarity: a left identity is a value 0l such that 0l . x = x for all x, and a right identity is a value 0r such that x . 0r = x for all x. They may not be both present / the same if the structure is not commutative.)<br>
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<strong>Do you know of example functions in these three categories?</strong>tag:ask.metafilter.com,2013:site.238714Mon, 08 Apr 2013 01:48:30 -0800knzCan a transcendental number raised to an algebraic power be algebraic?
http://ask.metafilter.com/236360/Can%2Da%2Dtranscendental%2Dnumber%2Draised%2Dto%2Dan%2Dalgebraic%2Dpower%2Dbe%2Dalgebraic
Can a transcendental number such as pi, be raised to an irrational, but algebraic power resulting in an algebraic solution? Complex solutions would be acceptable. There might be a quick proof here, or there might not be. - Thanks for any help you can offer answering this! (And I promise that this isn't for a class or anything like that!)tag:ask.metafilter.com,2013:site.236360Sat, 02 Mar 2013 06:33:30 -0800ch3coohClearly, this proves that I'm stupid
http://ask.metafilter.com/234391/Clearly%2Dthis%2Dproves%2Dthat%2DIm%2Dstupid
I can't seem to wrap my mind around the language of higher level math. Definitions, theorems, and proofs make me fall asleep, but I really do want to understand. Do you know of any good resources that can help me out? Back in high school (Canadian) I was a math whiz. I had no trouble with any of the concepts, including calculus in Gr 12. I can "do the math" and am good at problem solving. However when I got to university and started taking Number Theories, Abstract Algebra, etc., my logic suddenly disappeared on seemingly simple concepts. I've obtained my degree in CS already, somehow memorizing or handwaving my way through on my assignments and exams, but now I actually need to understand higher math for my current job.<br>
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For example, these are excerpts from one of my textbooks (A Concrete Introduction to Higher Algebra by Lindsay Childs):<br>
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[on real numbers] "The real numbers form a complete Archimedean ordered field...Archimedean means that for every positive real number r there is a natural number n with n > r."<br>
[division theorem] "Given nonnegative integers a > 0 and b, there exist integers q> 0 and r with 0 <= r < a such that b = aq +r<br>
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I thought I understood real numbers and division until I read these definitions and was also asked to prove them. First of all, my brain have difficulty just parsing out what's written; it's like a foreign language to me. Secondly I never know how to begin when proving things. I can somewhat follow along if there's an example in the textbook, but on my own I would be completely lost.<br>
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I'm not looking to take any classes in math or hire a tutor. Books or online resources would be good. At minimum I'm hoping to at least be able to read through a math textbook and actually understand the explanation.tag:ask.metafilter.com,2013:site.234391Thu, 31 Jan 2013 20:35:00 -0800lucia_engelThe use of Linear Algebra in Programming.
http://ask.metafilter.com/231710/The%2Duse%2Dof%2DLinear%2DAlgebra%2Din%2DProgramming
I just finished my first course in Linear Algebra. I know a fair amount of Python. Please help me come up with a project that combines the two. This past Fall semester, I took Linear Algebra I, a 200-level Math class at my school. (The next class, sequentially, is Linear Algebra II -- a 300-level class which is much more proof based.) I don't want to list everything that I learned, but I will say that the course covered a lot of material, and was quite rigorous.<br>
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Through the lectures, my professor would frequently reference Linear Algebra's application to computer science/computer graphics (e.g. how each pixel in an image can effectively be manipulated as an entry in a matrix). <br>
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Likewise, I want come up with a project that combines my newly acquired knowledge of Linear Algebra, with my ability to program.<br>
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A couple of notes with regards to the type of project that I am looking for:<br>
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1. I'm not really interested in game design or computer animation (and I know that both are predicated on Linear Algebra).<br>
2. I really like databases. In addition to Python, I know/am learning SQL -- I would love something of the sort that combines matrix manipulation with querying a database (if this is even a thing.)<br>
3. I'm learning Django, so any idea that involves building a (not too complex) web app would be great.<br>
<br>
Thanks a lot!tag:ask.metafilter.com,2012:site.231710Sun, 23 Dec 2012 10:46:06 -0800lobbyistAlgebra Question
http://ask.metafilter.com/229095/Algebra%2DQuestion
Can anyone help with an algebra question I am trying to help my neice with her homework. (9/2m) - (m+4)/4m = 5/36<br>
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11th grade algebra- do you multiply entire equation by 2m? lowest common denominator? help. An explanation would be great and also any websites that help with algebra would be great too. Thanks.tag:ask.metafilter.com,2012:site.229095Sat, 17 Nov 2012 11:35:42 -0800Summer FallNeed help finding an easy-to-follow Algebra textbook
http://ask.metafilter.com/226347/Need%2Dhelp%2Dfinding%2Dan%2Deasytofollow%2DAlgebra%2Dtextbook
Introductory Algebra Course - book recommendations? I'm now back in university, after being away for 3 years. Hurray! During my first term back (winter term), I need to take an introductory Algebra course in order to meet a prerequisite for an upper-year Psychology research class. The problem is, I haven't taken any Math classes since high school (so well over 5 years) and it has never really been my forte. No doubt it, this course is making me incredibly nervous. To top it off, the textbook required ("<a href="http://www.amazon.ca/Mathematics-Applications-Margaret-Lial/dp/0321334337">Mathematics with Applications</a>") for the course is supposedly incredibly hard to follow. I'm a big fan of easy-to-read literature, with lots of thorough examples and test questions; but I admit, the reviews about this text sound like it contains anything but.<br>
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Here is a gist of what we will cover: linear equations, exponential functions, matrices, system of functions, probability, compound interest.<br>
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It's a little early, but I'd like to get my hands on a textbook/resource to make me familiar with some of these concepts before I start the actual class. Is there an introductory algebra book that you liked, and would recommend?tag:ask.metafilter.com,2012:site.226347Tue, 09 Oct 2012 19:33:41 -0800raintreeHelp her learn Alg II by Tuesday
http://ask.metafilter.com/223432/Help%2Dher%2Dlearn%2DAlg%2DII%2Dby%2DTuesday
Sister just learned she has to take an Algebra II test on Tuesday that covers the whole shebang. She's forgotten (repressed?) most of it. What's her best bet for an Algebra II crash course that will go over all the topics? She's very smart, but not a math person.tag:ask.metafilter.com,2012:site.223432Thu, 30 Aug 2012 10:04:47 -0800goosechasingMy Trig Teachers Name Was Mr. Angle But That Didn't Make Him A Good Teacher.
http://ask.metafilter.com/222158/My%2DTrig%2DTeachers%2DName%2DWas%2DMr%2DAngle%2DBut%2DThat%2DDidnt%2DMake%2DHim%2DA%2DGood%2DTeacher
My math skills are no where near where I'd like them to be. Can you recommend a self-paced math learning site? Pretty much any branch of math can apply. Due to some amazingly awful teachers at some key points in my life Math and I have been in a state of cold war for decades. I'd really like for that not to be the case any more.<br>
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Ideally I'm looking for something like <a href="http://projecteuler.net/index.php">Project Euler</a> or <a href="http://rubykoans.com/">Ruby Koans</a> are for programming. That is: A site with increasingly difficult concrete problems that need solving, not just naked formulae. Substantially prefer hands on/reading over watching videos/lectures (<a href="http://www.khanacademy.org/">Khan Academy</a> hasn't really resonated with me).<br>
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As I mentioned pretty much any branch of math is fine. Algebra, trigonometry, calculus, differential equations, statistics, you name it, I'd like to be better at it.<br>
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High school level and above.tag:ask.metafilter.com,2012:site.222158Mon, 13 Aug 2012 12:20:53 -0800OokseerMath is Hard (I need help)
http://ask.metafilter.com/220566/Math%2Dis%2DHard%2DI%2Dneed%2Dhelp
Math is hard. Please help me with a slope-related problem. I have a project that is 103 inches high on one end, and 119 inches high on the other end. It is 394 inches long.<br>
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Given this information, I need an on-line calculator that can tell me the height of a vertical line drawn at any point along the 394 inch length.<br>
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PS: I know this is probably simple math, but I'm utterly failing at this for hours and hours. If I have to do the actual math problem I will, but I feel at this point that some kind of automatic calculator is going to be the best solution to get me the <i>right</i> answers, especially since I'm going to need to calculate 20 (or more) vertical lines along this distance.<br>
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Thank you!tag:ask.metafilter.com,2012:site.220566Sun, 22 Jul 2012 15:49:52 -0800anastasiavIs it possible to solve for X?
http://ask.metafilter.com/213821/Is%2Dit%2Dpossible%2Dto%2Dsolve%2Dfor%2DX
<strong>(Y)(S^N) = (M)(X^(N+E)) - (Y)(X^N)</strong> Is it possible to solve for X? I'm working on a manuscript (psychophysics), and it would be nice if I could solve for X in the following equation:<br>
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(Y)(S^N) = (M)(X^(N+E)) - (Y)(X^N)<strong><br>
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the damn E term seems to be ruining things. Without it, it's simple enough.<br>
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My math isn't the greatest, so I could really use some help!<br>
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thanks!tag:ask.metafilter.com,2012:site.213821Wed, 25 Apr 2012 14:45:27 -0800spacediverMr. Math Monster, I presume?
http://ask.metafilter.com/211266/Mr%2DMath%2DMonster%2DI%2Dpresume
Help me to learn math as an adult when I still despise the frustrating beast from my childhood! Since I was a kid, I’ve always struggled with math. I was apparently very good at it when I was a little girl, grasping concepts that hadn’t been taught to me yet, but somewhere in there I determined I hated math. Or that it was too hard. I even drew up a manifestation of my fear, the Math Monster. With 7’s for spines, 6’s for claws, 5’s for teeth, and extra numbers floating about in its half gelatinous, half dragon form, the creature is STILL what I think of when I even halfway glimpse an equation with x = ?.<br>
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Now, several years and maybe 2 to 3 college level Algebra classes later, I’m an adult who’s realized that math is actually useful. And pretty much a requirement for life. Especially when my “maybe I could…” interests show me possible life paths involving chemistry, physics, quadratic equations, and theoretical computer science.<br>
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Look, I know I’m smart, but I just need things explained to me in a way I can visualize. I’ve grasped many algebraic concepts before, but I find it difficult to remember even a few months later how to, let’s say for example, find the percentage for a restaurant tip.<br>
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Basically, I’m trying to get back into the math groove, and I’m looking for recommendations on textbooks that are neither dull as shit nor pandering like a kid’s picture book. I just want math to be interesting to me. These textbooks should also obviously be as accurate as possible, since I wouldn’t know an error even if it threw me a wet t-shirt party. <br>
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I note, btw, that I never was able to memorize my multiplication tables and have therefore become a near advanced level wizard at finger tapping to half sing-song tricks such as “5 x 5 = 25, 5 x 6 = THIR-ty” and “9 x 9 = the 49er’s” which flit by so fast now, I barely notice them anymore.<br>
Also of possible importance: if geometry were the only mathematical subject of importance, I’d have _that_ beast paraded around on a leash, wearing a tag that says “Snuffles”.<br>
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SO! More or less I want to review math starting from Algebra, reviewing Geometry, and onward. Can you help?tag:ask.metafilter.com,2012:site.211266Sat, 24 Mar 2012 04:33:38 -0800DisreputableDogOnline mathematics
http://ask.metafilter.com/208575/Online%2Dmathematics
Which are the best online courses for studying algebra and progressing up to trig, calculus, and differentials? Should I look into places like Khan Academy, MIT Open Courseware, etc? Does a community like Reddit have study groups? What other places should I look and and why? Quality is more important than whether it's free or cheap, and it needs to be something I can do strictly at home. I'd also like to know who offers options for tutoring, grading, assistance, etc. I'm pretty self-motivated and have reasons to learn this stuff.. I just need to know where to go.tag:ask.metafilter.com,2012:site.208575Sun, 19 Feb 2012 08:39:08 -0800crapmaticSimple solution
http://ask.metafilter.com/204944/Simple%2Dsolution
This is pretty straightforward algebra/chemistry which is why I'm embarrassed to ask my co-workers to help me so... If I have the dilution ranges of a series of solutions of MSG, how can I figure out, in grams, how much MSG I need in 1L of water to make the stock solution? I get that:<br>
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x M =y moles/z L <br>
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Let's say my stock would be 1.0x10(-1)M. And the molar mass of MSG is 169.111g/mol. <br>
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Given the above:<br>
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0.1M (msg) = 0.1moles/1.0 liter <br>
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and converting moles to grams = 0.1 moles x 169.111g/mol = 16.9g of MSG/L<br>
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Is that it? Or did I miss some element? It seems too simple but it's been a while.tag:ask.metafilter.com,2012:site.204944Thu, 05 Jan 2012 12:25:38 -0800Katine