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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? [more inside]

posted by obiwanwasabi on Jul 22, 2014 - 11 answers

posted by obiwanwasabi on Jul 22, 2014 - 11 answers

I am working through the mooculus calculus one mooc 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? [more inside]

posted by carpographer on Jun 17, 2014 - 5 answers

posted by carpographer on Jun 17, 2014 - 5 answers

For my pal...What is a good physics study guide for:
a) 1st semester algebra-based college physics
b) lots of solved problems
c) *without calculus*.
I remember liking Schaum's in undergrad, but I seem to recall it being calculus based.
Thx Hive!

posted by j_curiouser on Dec 15, 2013 - 4 answers

posted by j_curiouser on Dec 15, 2013 - 4 answers

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 *intellectually* understand the concepts I'm learning, execution is being made difficult by my lack of fluency with algebraic manipulation and calculus. [more inside]

posted by downing street memo on Nov 13, 2013 - 16 answers

posted by downing street memo on Nov 13, 2013 - 16 answers

Where can we find low cost math tutoring for 8th grade algebra? I've tried some web searches, but have not had much luck. [more inside]

posted by needlegrrl on Aug 5, 2013 - 8 answers

posted by needlegrrl on Aug 5, 2013 - 8 answers

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. [more inside]

posted by electric_counterpoint on Jun 12, 2013 - 7 answers

posted by electric_counterpoint on Jun 12, 2013 - 7 answers

[mathfilter] please give me some example algebraic structures that are not commutative, with exotic identity values. [more inside]

posted by knz on Apr 8, 2013 - 5 answers

posted by knz on Apr 8, 2013 - 5 answers

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!)

posted by ch3cooh on Mar 2, 2013 - 3 answers

posted by ch3cooh on Mar 2, 2013 - 3 answers

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? [more inside]

posted by lucia_engel on Jan 31, 2013 - 19 answers

posted by lucia_engel on Jan 31, 2013 - 19 answers

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. [more inside]

posted by lobbyist on Dec 23, 2012 - 11 answers

posted by lobbyist on Dec 23, 2012 - 11 answers

Can anyone help with an algebra question I am trying to help my neice with her homework. [more inside]

posted by Summer Fall on Nov 17, 2012 - 9 answers

posted by Summer Fall on Nov 17, 2012 - 9 answers

Introductory Algebra Course - book recommendations? [more inside]

posted by raintree on Oct 9, 2012 - 10 answers

posted by raintree on Oct 9, 2012 - 10 answers

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.

posted by goosechasing on Aug 30, 2012 - 11 answers

posted by goosechasing on Aug 30, 2012 - 11 answers

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. [more inside]

posted by Ookseer on Aug 13, 2012 - 7 answers

posted by Ookseer on Aug 13, 2012 - 7 answers

Math is hard. Please help me with a slope-related problem. [more inside]

posted by anastasiav on Jul 22, 2012 - 11 answers

posted by anastasiav on Jul 22, 2012 - 11 answers

posted by spacediver on Apr 25, 2012 - 24 answers

Help me to learn math as an adult when I still despise the frustrating beast from my childhood! [more inside]

posted by DisreputableDog on Mar 24, 2012 - 20 answers

posted by DisreputableDog on Mar 24, 2012 - 20 answers

Which are the best online courses for studying algebra and progressing up to trig, calculus, and differentials? [more inside]

posted by crapmatic on Feb 19, 2012 - 14 answers

posted by crapmatic on Feb 19, 2012 - 14 answers

This is pretty straightforward algebra/chemistry which is why I'm embarrassed to ask my co-workers to help me so... [more inside]

posted by Katine on Jan 5, 2012 - 8 answers

posted by Katine on Jan 5, 2012 - 8 answers

I have forgotten basically all of math, and I want to learn it again from the ground up. [more inside]

posted by showbiz_liz on Oct 19, 2011 - 28 answers

posted by showbiz_liz on Oct 19, 2011 - 28 answers

Mathfilter: In Gelfand's exceptional Algebra text, he is talking about the formula 1 + x + x^2 + x^3 + ... = 1/(1 - x). He uses the Achilles racing the tortoise model when first introducing the formula. He discusses the case x = 10, whence 1 + 10 + 100 + 1000 + ... = -1/9. [more inside]

posted by wittgenstein on Jul 27, 2011 - 8 answers

posted by wittgenstein on Jul 27, 2011 - 8 answers

I am redesigning a high-school Algebra course so as to make it more meaningful to the students. To that extent, I am trying to gather as many examples throughout our world of linear relationships. I was hoping to tap into the collective wisdom of this group to come up with as long a list as possible of linear relationships that actually exist (not contrived stuff). I once knew a teacher who had a plant that grew at a linear rate. I don't know the type of plant, however. And there are so many other linear relationships around us. I don't want everything they see be about a car's distance from home or the amount of money they saved. What do you know of that exhibits a linear relationship? I'd love to have a long list for students so that they see that studying linear relationships in Algebra really does matter. Thanks for any help in making this course more worth while to the students!

posted by mathmatters on Jul 21, 2011 - 16 answers

posted by mathmatters on Jul 21, 2011 - 16 answers

My son, who is finishing up third grade, loves math and especially the basic Algebra he's been doing. He is actually sad to be leaving school for the summer because he's so into it. How can I keep this going for him over the summer? Fun books, board games, computer (on-line and OSX) games? [more inside]

posted by bondcliff on Jun 8, 2011 - 42 answers

posted by bondcliff on Jun 8, 2011 - 42 answers

I am a GIS college student looking to develop my skills in programming, particularly in Python. For starters, I need to wake up my dormant math skills. What mathematics-for-programmers books, or general Computer Science books, should I be looking for? [more inside]

posted by ajax287 on Apr 10, 2011 - 9 answers

posted by ajax287 on Apr 10, 2011 - 9 answers

Multiple students taking an exam at different times come up with the same baffling answer. Help! [more inside]

posted by King Bee on Mar 21, 2011 - 24 answers

posted by King Bee on Mar 21, 2011 - 24 answers

The solution to 12 = x - (square root of x) is 16, but how do I manipulate the equation to show that? [more inside]

posted by Wanderboy on Feb 23, 2011 - 47 answers

posted by Wanderboy on Feb 23, 2011 - 47 answers

MathStoryProblem: I coach youth bball and need help with equal playing time substitutions with a line-up that varies week to week. I think some kind of formula or counting trick should help, but my math skills are failing me. Up to 15 kids, 10 substitutions per game (25 min halves - subs every 5 min). As close to equal amount of floor time as possible (obviously, this can't always be the case). [more inside]

posted by ten year lurk on Feb 23, 2011 - 6 answers

posted by ten year lurk on Feb 23, 2011 - 6 answers

Warning: wait to read this question until tomorrow if you are in Learned League.
So, today one of the Learned League questions was, What is the y-intercept of the line with the following equation?: 3y-11x = 39. I couldn't get any further than y = 13 + 3 2/3 x or y = 13 +3.66666x. Actually it appears the response is 13. How does one get to the right response for this question?

posted by bearwife on Nov 19, 2010 - 12 answers

posted by bearwife on Nov 19, 2010 - 12 answers

But Sir, what is x? Teaching students algebra for the first time. They keep wanting to put values in for x, and write that down.
E.g. x + x = . Becomes 1 + 1 = 2, in their books. Whereas I want x + x = 2x.
Does anyone have any strategies, or techniques to overcome this? [more inside]

posted by 92_elements on Nov 11, 2010 - 23 answers

posted by 92_elements on Nov 11, 2010 - 23 answers

How do people explain the FOIL rule of algebra in other languages? [more inside]

posted by twoleftfeet on Aug 23, 2010 - 31 answers

posted by twoleftfeet on Aug 23, 2010 - 31 answers

I have always had difficulty with mathematics. Now I'm in my mid-thirties and have gone back to school to study engineering. Things are not going appreciably better than they did the first time I went to university. What can I do to fill the gaps I have and become a skilled problem-solver? I want to go from being a C to being an A student. [more inside]

posted by rhombus on Mar 24, 2010 - 30 answers

posted by rhombus on Mar 24, 2010 - 30 answers

Why do people care about Cramer's rule? [more inside]

posted by leahwrenn on Mar 3, 2010 - 8 answers

posted by leahwrenn on Mar 3, 2010 - 8 answers

Is it possible to solve for x in y=(x^t)/(x-1), for any value of t? Wolfram alpha and maxima failed, so I guess not, but I'm interested in what more general classes of unsolvable equations this falls in.

posted by jewzilla on Feb 20, 2010 - 12 answers

posted by jewzilla on Feb 20, 2010 - 12 answers

Any recommendations for self-teaching guides to high school level math? [more inside]

posted by LastOfHisKind on Jan 23, 2010 - 12 answers

posted by LastOfHisKind on Jan 23, 2010 - 12 answers

What is the easiest way to calculate a location that is equidistant from three locations? (In this case: Baltimore, Chicago, Detroit) [more inside]

posted by sharkfu on Jan 15, 2010 - 17 answers

posted by sharkfu on Jan 15, 2010 - 17 answers

So I'm tutoring my cousin in algebra. Specifically, 9th grade algebra. Even more specifically, in preparation for the New York State Regents test in algebra. I'm 20 years older than he, and always found algebra pretty easy and straightforward. What tips do you have for a 34 year old tutor to a 14 year old who is struggling with algebra?

posted by dfriedman on Nov 7, 2009 - 10 answers

posted by dfriedman on Nov 7, 2009 - 10 answers

I am having the hardest time working with positive and negative integers in elementary algebra. Please hope me. [more inside]

posted by hollygoheavy on Oct 5, 2009 - 20 answers

posted by hollygoheavy on Oct 5, 2009 - 20 answers

Not Homework Filter! Paypal Filter: Paypal charges me 2.9% plus $0.30 for every transaction. Someone needs to pay me X. What is the formula to determine how much they need to send with paypal so I get X and not X - (X * 0.029) - 0.30? [more inside]

posted by arniec on Oct 2, 2009 - 16 answers

posted by arniec on Oct 2, 2009 - 16 answers

Is there an easy-to-use computer program (other than TI Interactive) I can use to draw graphs of functions when I'm writing my Algebra 2 tests? [more inside]

posted by junipero on Sep 15, 2009 - 6 answers

posted by junipero on Sep 15, 2009 - 6 answers

I need help with a math problem my sister-in-law has for homework. It involves adding and multiplying roots and it's been long enough since college that I don't quite remember how to do that. The question is: 3sq(5)[2sq(5)-5]. I did it two different ways, getting 15sq(5) once and 9sq(5) the next. Is either right? An answer would be appreciated and, moreover, an explanation as to how to do it. Thanks!

posted by dbooster on Jun 10, 2009 - 7 answers

posted by dbooster on Jun 10, 2009 - 7 answers

In need of some daily source of random math problems (upto basic calculus) that will reinforce or (if necessary) re-establish some real fundamental concepts in the algebra portions of calculus, unless something else might work. [more inside]

posted by JoeXIII007 on Feb 11, 2009 - 4 answers

posted by JoeXIII007 on Feb 11, 2009 - 4 answers

I have a friend who is looking for an algebra tutor in the Los Angeles area. Anyone have experience with one or know how to find one? [more inside]

posted by Kimberly on Jan 7, 2009 - 4 answers

posted by Kimberly on Jan 7, 2009 - 4 answers

Maximizing a function over orthogonal matrices, or: solving polynomial order 2 systems. Help me out or point me to a better forum / listhost. [more inside]

posted by a robot made out of meat on Oct 26, 2008 - 15 answers

posted by a robot made out of meat on Oct 26, 2008 - 15 answers

I have a super-complicated algebraic equation I (somehow) developed as the solution to developing appropriate grid-based web design that has me completely stumped... [more inside]

posted by fauxtoes on Oct 23, 2008 - 20 answers

posted by fauxtoes on Oct 23, 2008 - 20 answers

Please help me wrap my head around this 3d graphics math. :( [more inside]

posted by mebibyte on Oct 14, 2008 - 9 answers

posted by mebibyte on Oct 14, 2008 - 9 answers

Applied Math Filter: Help me use math!
I'd like to learn more about mathematics and it's practical applications - particularly in Computer Science [more inside]

posted by dcbarker on Aug 1, 2008 - 13 answers

posted by dcbarker on Aug 1, 2008 - 13 answers

I need to brush up on my basic college math skills for a course readiness assessment in a week. What are some good resources online and what should I focus on? [more inside]

posted by baphomet on Jun 17, 2008 - 4 answers

posted by baphomet on Jun 17, 2008 - 4 answers

I tutor several people in a "Mathematics for the Social Sciences" course at a local university. This semester the material is focused on matrix algebra. For the most part, they have no trouble wrapping their heads around the notions of basic vector operations, row reduction, systems of equations, inverse matrices and determinants. But, they have a lot of problems with more abstract concepts such as linear independence, subspaces, basis and dimension. I'm wondering if anyone has any tips on helping them visualize and understand these ideas more clearly.

posted by Proginoskes on Mar 30, 2008 - 7 answers

posted by Proginoskes on Mar 30, 2008 - 7 answers

Anyone good with GAP? I've defined a largish permutation group and would like to make a tally of elements by cycle type - how many of each cycle type occurs in the group. Possible? Trivial? Use something else instead? Oh, and where's the *right* place to ask GAP questions?

posted by Wolfdog on Mar 9, 2008 - 1 answer

posted by Wolfdog on Mar 9, 2008 - 1 answer

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