Ask MetaFilter questions tagged with math
http://ask.metafilter.com/tags/math
Questions tagged with 'math' at Ask MetaFilter.Thu, 05 Mar 2015 15:31:15 -0800Thu, 05 Mar 2015 15:31:15 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Books/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>
<br>
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>
<br>
<br>
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>
<br>
<br>
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>
<br>
<br>
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 soLooking for a blogging platform that handles equations and code
http://ask.metafilter.com/276540/Looking%2Dfor%2Da%2Dblogging%2Dplatform%2Dthat%2Dhandles%2Dequations%2Dand%2Dcode
My friend and I are starting an academic blog. We will be posting equations and code snippets (mostly MATLAB), and are looking for a blogging platform that will allow us to enter them easily and display them nicely. Do you have any suggestions on what we should use?tag:ask.metafilter.com,2015:site.276540Fri, 27 Feb 2015 11:58:42 -0800tickingclockHow can I quantify these fitness scores?
http://ask.metafilter.com/276406/How%2Dcan%2DI%2Dquantify%2Dthese%2Dfitness%2Dscores
Hey math/fitness nerds. I'm working on a pet project. I'm trying to quantify general fitness levels across a population based on a few different scores. I have the tests, but need help setting up the values of each score. This question is not about the validity of these tests, it's about numbers. I'm open to discussion about the tests, but not here. (Please mail me if you have strong opinions about the tests.) This is strictly a math question.<br>
<br>
I'm trying to give each score a value out of 100 so the scores can be displayed in a radar-style graph.<br>
<br>
The tests are as follows:<br>
Overhead squat mobility test. Score from 1-5 points. (5 = 100%)<br>
1.5 mile run test time. 10 min 30s = 100% (630 seconds.)<br>
500 meter ergometer row test time. 1 min 37 s = 100% (97 seconds)<br>
1 Rep Max Deadlift. A weight of 1.75 bodyweight = 100%.<br>
<br>
So here's an imaginary test subject:<br>
Male<br>
185 lbs<br>
Squat evaluation = 4/5<br>
1.5 mile run time = 12 minutes or 720 seconds.<br>
500 meter row time = 2 min or 120 seconds.<br>
1RM Deadlift = 225 lbs. At 185 lbs he'd need to pull 323.75 lbs.<br>
<br>
So I'd like to know the best way to put each of the scores at a 100 point value. This is slightly tricky for me as obviously higher times would be worse than lower times.<br>
<br>
Could someone help me with the formula in excel so I could just drop the scores into a spread sheet and get some answers? This is a basic math question not really an excel question. I know it's the sort of thing that's dead easy for some people but fairly mystifying for me.<br>
<br>
To use the above examples:<br>
Goal time for 1.5 miles is 10 minutes and 30 seconds. (630 seconds.) The subject ran 1.5 miles in 720 seconds. How can I set up the formula so that 720 seconds is scored out of 100 on a scale that uses 630 as a perfect score of 100 with anything larger being a worse score?<br>
<br>
Thanks.tag:ask.metafilter.com,2015:site.276406Wed, 25 Feb 2015 02:42:52 -0800TelfSomething more interesting than :(){ :|:& };:
http://ask.metafilter.com/276254/Something%2Dmore%2Dinteresting%2Dthan%2Dand
What are some fun, computationally intensive tasks for my new computer to do? I just got a new computer and I feel like making it work really hard. What are some things to do? Assume I can program, and that I can install most languages, libraries, and software packages (including MATLAB and Mathematica). 4 cores, NVIDIA GPU. I'm leaving this deliberately broad, but here are some loose criteria (all of which are optional):<br>
<br>
<ul> <br>
<li>doesn't require too much investment in specialist libraries or domains of knowledge</li><br>
<li>results are pretty, lots of colors</li><br>
<li>learning how to do it might be somewhat educational</li><br>
<li>if results not visual, they are interesting on their own terms</li><br>
</ul><br>
<br>
It has already occurred to me to draw a very, very high resolution picture of the Mandelbrot set, but I was hoping you all would have something more original. Do not limit yourself to rendering mathematically interesting bitmaps!tag:ask.metafilter.com,2015:site.276254Sat, 21 Feb 2015 15:15:26 -0800vogon_poetProbability distributions and their practical applications
http://ask.metafilter.com/276170/Probability%2Ddistributions%2Dand%2Dtheir%2Dpractical%2Dapplications
I am looking for a resource that lists probability distributions and their common real-world applications. For example, I'd expect to see: Lognormal - daily returns in the stock market. Poisson - failure rates for mechanical equipment, ... The closest I can find is this wiki entry. http://en.wikipedia.org/wiki/List_of_probability_distributions<br>
<br>
Ideally this would be a handbook which includes applications in as many fields as possible (biology, actuarial, physics, etc.) Does this resource exist?tag:ask.metafilter.com,2015:site.276170Thu, 19 Feb 2015 13:19:17 -0800wivyHelp me do some math?
http://ask.metafilter.com/275828/Help%2Dme%2Ddo%2Dsome%2Dmath
Help me do some math? I have four buckets. I need to fill each bucket with a certain number of widgets (no more, no less) from a pile. How many possible variations exist?<br>
<br>
BUCKET ONE:<br>
- Holds 4 widgets.<br>
- There are 4 widgets to choose from.<br>
<br>
BUCKET TWO:<br>
- Holds 3 widgets.<br>
- There are 7 widgets to choose from.<br>
<br>
BUCKET THREE:<br>
- Holds 4 widgets.<br>
- There are 13 widgets to choose from.<br>
<br>
BUCKET FOUR:<br>
- Holds 2 widgets.<br>
- There are 10 widgets to choose from.<br>
<br>
I'm sure I learned how to do this in school, but that knowledge has long since left my brain. If you could show me how you do the calculation in addition to giving the answer, I'd appreciate it!tag:ask.metafilter.com,2015:site.275828Thu, 12 Feb 2015 08:25:00 -0800NotMyselfRightNowKeeping on top of the snowstorm -- does it really matter?
http://ask.metafilter.com/275673/Keeping%2Don%2Dtop%2Dof%2Dthe%2Dsnowstorm%2Ddoes%2Dit%2Dreally%2Dmatter
I am in the snowy state of Massachusetts and avoiding my next foray out to shovel. Plus, spouse and I slightly disagree on how often we really need to go out and shovel. Does it really save time to shovel every few hours throughout the storm? I have a suspicion that it doesn't really save time, and that we be just as fine waiting until the end of the snowstorm -- is there a way to think this through mathematically to find a good answer?tag:ask.metafilter.com,2015:site.275673Mon, 09 Feb 2015 09:40:37 -0800lillygogGiant numbers (Ex: how many primes are smaller than the largest known?)
http://ask.metafilter.com/275591/Giant%2Dnumbers%2DEx%2Dhow%2Dmany%2Dprimes%2Dare%2Dsmaller%2Dthan%2Dthe%2Dlargest%2Dknown
Many sites say that the largest known prime is "2^57,885,161 − 1, a number with 17,425,170 digits." Given this and well known research about the density of primes, I think it's at least possible to estimate the number of primes between 1 and 2^57,885,161 − 1. But I don't know how to do this myself.
I really want the answer to this one (the order of magnitude at least), but I've got lots of these, and I'd ideally like more cool ones. :) For context, I'm making an activity for high school students in an afterschool math program. The activity is aimed at understating really big numbers, and this part of the program (4 sessions) is focused on bijections and infinties, with a theme of how mathematicians think about topics that are too large or abstract to handle with intuition, and for how mathematicians make choices that shape what the mathematics we study looks like. For this activity in the first session, in addition to many mathematical examples, I want to include some examples from life and things in the middle (like the limits of modern computation.)<br>
<br>
The activity is not to calculate these quantities, but rather to estimate them to the extent that they can be ordered least to greatest.<br>
<br>
I would greatly appreciate<br>
A) Suggestions for additions to this list<br>
B) Estimations for new additions or for the items listed below with question marks<br>
C) Corrections to this list if you think one of my listed estimations is at the wrong order of magnitude <br>
D) An estimate for the primes question in particular. <br>
<br>
THANKS!<br>
<br>
----------------------------------------------------------------<br>
<br>
The list so far:<br>
<br>
* The number of primes between 0 and 2^57,885,161 − 1<br>
* If two 'opponents' at Go are actually collaborating to make the game as long as possible, how many turns might the game last (on a 19x19 board)? (???)<br>
* The number of different chess games for which the board never returns to a previously experienced state. (???)<br>
* The approximate number of atoms in everything living on the earth (???)<br>
<br>
* The approximate circumference of the earth in miles (~10^4)<br>
* The approximate number of sheets of paper in a stack as tall as the height of the Transamerica Pyramid in SF (~10^6)<br>
* The approximate number of seconds in a human life (~10^9)<br>
* The approximate number of people in the world right now (~10^10)<br>
* The approximate number of neurons in a human brain (~10^11)<br>
* The approximate number of seconds between now and when a dinosaur last lived (~10^15)<br>
* The approximate number of ants in the world right now (~10^16)<br>
* The approximate number of calculations that can be done by the world's current fastest computer (The Tianhe-2 supercomputer) in 1 minute (~10^18)<br>
* The approximate number of stars in the universe (~10^30)<br>
* The approximate number of atoms in the earth and everything on it (~10^50)<br>
* The approximate number of different ways a deck of 52 cards might be shuffled (~10^68)<br>
* The approximate predicted number of atoms in the universe (~10^80)<br>
* The approximate number of rabbits that would exist in the universe after a year if, starting with 2 rabbits, ever day, every pair of rabbits alive mate and produce 6 offspring, and no rabbits ever die. (~10^219)tag:ask.metafilter.com,2015:site.275591Sat, 07 Feb 2015 05:40:29 -0800ch3coohDouble checking math for the gaslit
http://ask.metafilter.com/275560/Double%2Dchecking%2Dmath%2Dfor%2Dthe%2Dgaslit
A math problem followed by an issue with the boss. <br>
The math: my boss gives me 50 picomoles per microliter of human serum albumin as standard, with a molecular mass of about 66400 grams per mole. I loaded, as per his instructions, 100 microliters of that. I loaded 100 micrograms (in 100ul again) of keyhole limpet haemocyanin which has a molecular mass of 390000 grams per mole. Unless I'be goofed in the math, I loaded 332 micrograms (250 picomoles total) of HSA standard he ordered me to load. On the sample run, I loaded 100ug (39 picomoles total) of KLH. If that checks out with everyone else, awesome, please continue below and help me. If it doesn't then the following is still an issue but of a different flavor. <br>
<br>
So there was a problem with the equipment (sample loop on the HPLC) that caused the sample of KLH to be lost. My boss blows up at me and whether he was spitting because he was so worked up or because he was chewing again, it was still a sight this chemist wishes to never see again. He was angry because I had spent two days on the KLH sample and wasted it all (ignoring my feeble "but I saved 10ul for the mass spec analysis after this looked good by RP-HPLC!"), burning time, money (<$100), and used 300% of the HSA mass to boot. "Brainlessly" "thoughtless" "stupid" etc all made appearances here.<br>
<br>
But the math doesn't bear out, I used 1/3 the mass and was in no danger of overloading the column as he was going on about. It's a shame the sample was lost but I don't feel like there was any way for me to catch that before it happened. <br>
<br>
So the KLH is a side project that I'm doing while waiting for the real work to pick up again. I've also brought a second HPLC back from the dead, organized things in the lab, prepped for the real work starting up again next week, successfully explored a new method to augment the real work, and read whatever I could get my hands on about HPLC (which I had no direct experience in until three months ago, I was an Acta/FPLC guy and self taught this while waiting for the product rep to show up and give lessons, which never happened). I feel like in the three months I've worked here, I've done good stuff for someone who went from life science lab to a mass spec/organic lab. <br>
<br>
There has been one time when I did do something stupid (miscut a gel and let the labels on the tubes run off in the presence of acetone) and plenty of blowups over tiny things. Every time, he says something along the lines of, "I'm not angry just..." or "I'm not pissed with you but..." which is patently not the case. He was angry, that he calmed down 30s later while we were still talking isn't the same as not having exploded in the first place. He isn't always angry but that doesn't really matter when the stress from walking on eggshells around him accumulates. <br>
<br>
He is my point of contact here as a contractor but weirdly I was hired by another department to work for him. I'm around this other department, am invited and attend their lab meetings, and am on good terms with their boss (my actual boss?). So I want to send my angry point of contact a polite but firm letter addressing the math issue and how the stress stemming from his outbursts is not acceptable to me. I don't want to talk about it face to face at first as, well, I am not the strongest lily in the wilting lily garden, I would rather set the tone without having to be a strong confident speaker that doesn't get railroaded by outbursts and excuses. Would that work? Are there any other lines of approach people would suggest? If this doesn't get better, should I go talk to other-department boss, the budget of whom I fall under? <br>
<br>
I'm strangely not afraid, career wise. It's only been three months but I've self taught the industry standard instrument to what I think of as a remarkable degree (making my own programs that work, confirming separations by gel, optimizing purification). My current contract gives me two weeks pay on leaving (going to double check this in case things go way south way fast) and I live in the DC area, so a fair number of jobs for HPLC fluent life scientists. <br>
<br>
This is so weird for me. Thanks for the help in advance everyone!tag:ask.metafilter.com,2015:site.275560Fri, 06 Feb 2015 12:38:19 -0800AnonymousLearning math online
http://ask.metafilter.com/275385/Learning%2Dmath%2Donline
I want to learn math. I signed up for Khan Academy and I like the format a lot. I really like that there are short lessons that I can complete, and that the software automatically checks the answers and lets me continue when I completed a string of 5 good answers in a row (or something similar). I don't like the video explanations though. I'm just not a video person, I learn much better from text. Is there something like Khan Academy where you can do math exercises online but where the explanation is in text?tag:ask.metafilter.com,2015:site.275385Tue, 03 Feb 2015 03:38:30 -0800blubI know enough calculus to think of the question but not the answer
http://ask.metafilter.com/275362/I%2Dknow%2Denough%2Dcalculus%2Dto%2Dthink%2Dof%2Dthe%2Dquestion%2Dbut%2Dnot%2Dthe%2Danswer
You want to walk 10 blocks north and 10 blocks east. It would be shorter to walk along the hypotenuse, but the same distance to walk 1 block north, then 1 block east, then 1 block north, etc. it seems that if the blocks were infinitesimally short, it would approximate the hypotenuse, but alas, walking 10 blocks in one direction and then 10 blocks in the perpendicular direction is the same as dividing it up. What gives?tag:ask.metafilter.com,2015:site.275362Mon, 02 Feb 2015 12:58:13 -0800i_am_a_fiestaHow do I draw like MC Escher?
http://ask.metafilter.com/275144/How%2Ddo%2DI%2Ddraw%2Dlike%2DMC%2DEscher
I'd like to understand how Escher made his architectural illusion drawings so I can model similar environments in 3D and then use those models to draw my own creations out on paper. How do I even get started? Since I was a kid I was fascinated by MC Escher's impossible architecture drawings. I particularly loved the infinite waterfall, endless stairs, and drawings where there are warped or overlying perspectives where you are looking up and down at the same time.<br>
<br>
It occurred to me recently that I could MAKE these sort of images myself.. if I only knew how. I have a fair amount of art training and have lots of ideas for what things could look like and what sort of odd creatures I could populate them with but zero idea on how to actually get started. Most books on Escher I have read don't really include any detailed information on how he actually planned and created his images, only vague allusions to grid paper and models that he used.<br>
<br>
My question is in several parts. <br>
1. How do I understand perspective and the perspective tricks underlying optical illusions? Most books on learning art and drawing perspective have been on basic 1, 2, and 3 pt perspective which is not really what I want to learn at all. Is there a good book on understanding warped perspectives and/or the visual basis of his sort of optical illusions? Looking for good books on understanding/creating optical illusions has been rather fruitless as well.<br>
<br>
2. How do I model Escher-esque environments in 3D so I can then draw them? I'm willing to learn whatever 3D program (I only know 2D Adobe programs right now) that could get the basic forms down (mostly to model arches, stairways, and etc) but I haven't the foggiest idea on which would be most suitable. I know Escher illusions only "work" in 2D, so they can't really be modeled properly in 3D. The 3D models would only look right from certain angles. But the goal would just be to output some kind of limited shading 3D rendering that I can then draw over.<br>
<br>
So: Is there a simple 3D program that includes perspective grids and the like that you can fiddle with? Is there even options in 3D programs for that? Is there a 3D program that can do isometric views? Which 3D programs could do this that aren't hard to learn?<br>
<br>
3. Once upon a time I used Google Sketchup. Could Sketchup be used in this way? <br>
<br>
I'm honestly flummoxed here on how to even begin or what to even research, so any information or suggestions at all would be highly appreciated.tag:ask.metafilter.com,2015:site.275144Wed, 28 Jan 2015 21:35:22 -0800everyday_naturalistSesame Street has me flummoxed
http://ask.metafilter.com/274708/Sesame%2DStreet%2Dhas%2Dme%2Dflummoxed
Sesame Street, when naming parts of shapes, consistently talks about the number of sides and the number of angles. For example a hexagon has six sides and six angles. This makes me crazy. I thought the pointy parts were "corners" or something like that. Doesn't a shape have infinite angles? If any three points can form an angle? Does 180 degrees not count as an angle? Isn't corner a more precise word?tag:ask.metafilter.com,2015:site.274708Tue, 20 Jan 2015 04:34:30 -0800OwowthathurtsHow to Tell Excel to Evaluate Last Three Months (NOT Last 90 Entries)
http://ask.metafilter.com/274661/How%2Dto%2DTell%2DExcel%2Dto%2DEvaluate%2DLast%2DThree%2DMonths%2DNOT%2DLast%2D90%2DEntries
I have an Excel spreadsheet I use to track glucose readings. There’s a value diabetics use called “A1C” which looks at the last three months of readings. It's based on a blood test, but can be estimated by averaging your readings for the last three months. I try to track every day, but I can’t reliably say “look at the last 90 values” – so I’m wondering how to set up a formula to tell it to only look at readings going back 90 days, not necessarily 90 readings. More inside. The formula to convert a glucose reading to an A1C value is =((<i><b>[value]</b></i>+77.3)/35.6). So converting an individual reading isn’t a problem.<br>
<br>
But, basically, I’d like to create a new column for my spreadsheet which gives me a sort of running A1C average – always looking back three months from the current entry and telling me what the average of the last three months of readings would be. But, as said above, I can’t tell it to merely look back 90 entries, since if I missed a few days or a weekend, I don’t want it to look back further.<br>
<br>
The dates are kept in column A, the time in column B, the reading in column C.<br>
<br>
It'd be preferred not to use VBA to solve the issue, if that's possible.<br>
<br>
Any help would be appreciated.tag:ask.metafilter.com,2015:site.274661Mon, 19 Jan 2015 08:18:09 -0800WCityMikeChaos Theory Explained for Non-Math People?
http://ask.metafilter.com/274584/Chaos%2DTheory%2DExplained%2Dfor%2DNon%2DMath%2DPeople
My curiosity whetted by the first few paragraphs (and double pendulum illustration) of <a href="http://en.wikipedia.org/wiki/Chaos_theory">the Wikipedia entry</a>, I want to learn as much and as deeply about chaos theory as possible without needing to know mathematics. Also interested in philosophical implications. Videos? Books or apps or web sites? My math may be weak, but I'm otherwise intelligent, so I'd prefer something much more thorough than, say, "Through the Wormhole" (I realize the math limitation's a huge hindrance, though).tag:ask.metafilter.com,2015:site.274584Sat, 17 Jan 2015 09:49:58 -0800Quisp LoverMultiplication and division resources for a 1st grader
http://ask.metafilter.com/274540/Multiplication%2Dand%2Ddivision%2Dresources%2Dfor%2Da%2D1st%2Dgrader
My first grader is asking about multiplication and division. Where do I start? He does well in math at school. His class is up to adding double-digit numbers like 50+8, and three "partners" of single digit numbers.<br>
<br>
He asked me about multiplication a couple months ago, and I got him a multiplication table and tried to explain it as best I could. Then last night he asked me to explain division. I did what I could with the forks and straws on the dinner table, but realize I suck at teaching, especially math.<br>
<br>
What are some good books, apps, websites I can use to introduce him to multiplication and division? Thanks!tag:ask.metafilter.com,2015:site.274540Fri, 16 Jan 2015 12:07:08 -0800DakotaPaulNetherlands Master's in education vs teaching experience in Asia, which?
http://ask.metafilter.com/274367/Netherlands%2DMasters%2Din%2Deducation%2Dvs%2Dteaching%2Dexperience%2Din%2DAsia%2Dwhich
I have a B.Sc in computer science and have one year of experience English using my CELTA qualification. Looking around, I see a lot of requests for people with North American B.Sc's to teach Math/Physics/CS in Asia. I'm trying to decide whether to go and start teaching, or whether it is better to get a state teaching qualification (2yr) in the Netherlands first... I love teaching. I have been teaching English for about a year now, and I think I would like to continue in the classroom. I think I would be happier teaching in my subject though (math/physics/CS).<br>
<br>
I have worked about 13 years in the North American software industry, have a B.Sc, and have a CELTA qualification to teach English.<br>
<br>
I am trying to decide how to maximize my opportunities in teaching math/science, and my options are currently<br>
<br>
1 - head to Utrecht and take a 2 year Master's program resulting in a Dutch highschool teaching qualification<br>
2 - head to Asia and begin teaching, gaining valuable classroom experience at international schools there<br>
<br>
I am curious -- without an EU state qualification, will I have trouble teaching at international/IB schools in the EU (or elsewhere) in the future, or might my B.Sc plus relevant work experience be sufficient? I don't want to pigeonhole myself into being an Asian expat teacher for my whole career, and if the Master's program will provide more opportunity I would like to take it now.<br>
<br>
Some facts:<br>
- Born and raised in Canada, but I carry both Canadian and EU (Netherlands) passports.<br>
- Native English speaker.<br>
- B.Sc in Computer Science was taken from a reputable school in Canada.<br>
- M.Sc I am looking at is offered in English in the Netherlands and provides a state teaching cert.<br>
- Carry the Cambridge CELTA certificate and (will) have 1yr teaching experience.tag:ask.metafilter.com,2015:site.274367Tue, 13 Jan 2015 07:47:06 -0800jpzillerHelp me solve this real-life math problem.
http://ask.metafilter.com/274344/Help%2Dme%2Dsolve%2Dthis%2Dreal%2Dlife%2Dmath%2Dproblem
I need to use math to figure out how to fill my pill organizer correctly. I have one of those weekly pill organizers that has 7 compartments, SMTWTFS. Each morning I take 3 pills. Two of those pills come in loose bottles - great. But the third pill comes in foil sheets that contain 7 pills each. I refill my pills on Sundays, because the leftmost compartment is for Sunday, and I have more time on the weekends to do this.<br>
<br>
The problem: I started using the pill holder on a Wednesday, so my foil-wrapped pills are out of sync with the week. I always finish the week in the middle of a sheet.<br>
<br>
How do I sync back up so that I can eventually finish a foil sheet of 7 pills on a Saturday and start a new sheet on a Sunday? I know it somehow involves temporarily using pills from more than one sheet until the pill holder and the foil sheet are in sync, but for some reason I can't figure out how to do this.<br>
<br>
So how do I do this?tag:ask.metafilter.com,2015:site.274344Mon, 12 Jan 2015 16:19:14 -0800Tin ManCan't scribe, want to do math
http://ask.metafilter.com/274002/Cant%2Dscribe%2Dwant%2Dto%2Ddo%2Dmath
Entering old age I want to revisit undergraduate mathematics from decades ago. In this plan (fantasy?) I will go through text books & web sources to replicate and extend what I once knew (or what I think I knew!). The problem: a slight finger tremor (nothing lethal or degenerate) makes writing difficult and borderline illegible, even to me. I'm comfortable with technology and can type fast but, at least for me, a piece of paper and pen to write out calculations and proofs and doodle with diagrams etc is part and parcel of the process.<br>
<br>
Does anyone know of a tablet app that might help? I'm thinking of a free form surface that would recognize math symbols & notation and render them legibly. Of course, if I can barely read it, I suppose the software would have a tough time too.<br>
<br>
How do young mathematicians now do their work? Still with pen and paper, or somehow on a computer?<br>
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Any ideas or thoughts would be appreciated.tag:ask.metafilter.com,2015:site.274002Mon, 05 Jan 2015 16:36:57 -0800Kevin SBar Crawl Planning + Math = Happy Drunks!
http://ask.metafilter.com/273932/Bar%2DCrawl%2DPlanning%2DMath%2DHappy%2DDrunks
I am currently planning a bar crawl and could use some help.
There are 6 groups and 6 bars. Each group will start at a different bar (Stop 1). Each group will then meet up with a different group at Stop 2, Stop 3, etc., totaling 6 stops. Each group will need to meet each other group one time. Ideally, no group would repeat a bar, ie. each group will meet each other group and hit all 6 designated bars.
I've been trying to manually chart this and I'm pulling my hair out. Is there a way to figure this out with math or some other voodoo that I'm not aware of?tag:ask.metafilter.com,2015:site.273932Sun, 04 Jan 2015 14:49:34 -0800trynitiNumbers to Words
http://ask.metafilter.com/273027/Numbers%2Dto%2DWords
I want a plain text file listing the English words for number 1-100 (ideally, one per line any delimiter will be fine, I can fix that). One, Two, ..., One Hundred. It's got to be somewhere on this great internet. Can AskMe find it <strong>fast</strong>?tag:ask.metafilter.com,2014:site.273027Mon, 15 Dec 2014 08:11:19 -0800WolfdogHow do I solve for a percentage of a total budget...
http://ask.metafilter.com/272786/How%2Ddo%2DI%2Dsolve%2Dfor%2Da%2Dpercentage%2Dof%2Da%2Dtotal%2Dbudget
This will be easy for someone, but math is my second language so I'm at a loss.
How do I solve for the percentage of a TOTAL budget, when one line item is unknown (and is part of the total budget)? Specifically, I have a budget with 20 line items. I know the value of all the line items, except for one, and that one unknown value has to equal 16.5% of the TOTAL budget. How do I figure this out? Without that line item to start with, I don't have the total budget - does this question make sense?<br>
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Bonus if you can tell me what formula to plug into Excel so that I never have to think about this again.<br>
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Thanks so much!tag:ask.metafilter.com,2014:site.272786Tue, 09 Dec 2014 15:46:28 -0800coollibrarianOnline resources for brushing up on basic math skills?
http://ask.metafilter.com/272764/Online%2Dresources%2Dfor%2Dbrushing%2Dup%2Don%2Dbasic%2Dmath%2Dskills
What are some good, free online resources for an adult who needs to brush up on basic math operations such as working with fractions, percentages and ratios? Other than Khan Academy. The more interactive the better.tag:ask.metafilter.com,2014:site.272764Tue, 09 Dec 2014 10:33:17 -0800iamisaidDoes it ever make sense to get a second undergrad degree?
http://ask.metafilter.com/272648/Does%2Dit%2Dever%2Dmake%2Dsense%2Dto%2Dget%2Da%2Dsecond%2Dundergrad%2Ddegree
Ages ago, I posted <a href="http://ask.metafilter.com/132373/FutureEducationMoneyxTime">this question</a>. Sadly, I'm still stuck in <a href="http://ask.metafilter.com/265001/Have-you-transitioned-successfully-out-of-pink-collar-admin-hell-How">pink collar admin hell</a> and still looking for a way out. I'm not interested in climbing the ladder to get past the admin assistant jobs - I want to get away from this world altogether. More education seems like the only option, but my terrible undergrad record means that graduate school is out. I've been shying away from community college certifications because I have no way of knowing whether I'd like or be competent in any particular field. I don't want to spend a year learning electronics technology (just for example) only to find that I'm no good at it or hate the work environment that goes with it. <br>
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However, I do know that I like math - I've taken several undergrad math courses on my own (calculus, linear algebra, differential equations) and done well. I also know that any technical career is going to require computer science skills, of which I currently have none. But I live near a university that offers a combined CS/Math BS degree, and I'm thinking of trying to get into that program to open up my options career-wise.<br>
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My fears are these: 1) it's conventional wisdom that spending money on a second undergrad degree is a waste (this has kept me from enrolling in any program for the last few years); 2) I've never picked up any computer science on my own and might not have the knack for it. Likewise, I enjoy learning math but my knowledge fades pretty quickly when I'm not using it and 3) I'm too old (33) and thus wouldn't be appealing to potential employers upon graduation.<br>
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Is it always a bad idea to start over and pay to get another undergrad degree, especially later in life? Has anyone here made a similar switch to a technical career in their mid-thirties or later?tag:ask.metafilter.com,2014:site.272648Sun, 07 Dec 2014 15:28:50 -0800missixCan you turn these variables into something like a plan?
http://ask.metafilter.com/272582/Can%2Dyou%2Dturn%2Dthese%2Dvariables%2Dinto%2Dsomething%2Dlike%2Da%2Dplan
Help me take these numbers and variables and work them into a planning/predictive equation. I would like to take a couple years off work to complete a creative project. Is there a way to predict/create a time when I can be 2 years “ahead” of my retirement goal and also have enough to live on for 2 years? Help me do the maths.<br>
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I would like to retire in about 30 years.<br>
I have S in savings/emergency fund.<br>
I have R in a Roth IRA.<br>
I have I in investments.<br>
I spend about M dollars a month. (assume this to be fixed)<br>
I earn X per year.<br>
I pay D in per month in student loans, being repaid in Income-based Repayment.<br>
I have Y in a work-loan, reduced at 20% a year (100% repaid in 5 years)<br>
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Am I missing any variables that might impact this? Any other thoughts on doing this sort of planning? I've never done it before. Thanks!tag:ask.metafilter.com,2014:site.272582Sat, 06 Dec 2014 05:01:56 -0800Calicatt