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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 - 13 answers

posted by obiwanwasabi on Jul 22, 2014 - 13 answers

I've been asked at work to come up with a list of topics that could be included in a training course around basic maths for business people, and I am finding it hard to find suggestions for topics. [more inside]

posted by StephenF on Jan 14, 2014 - 12 answers

posted by StephenF on Jan 14, 2014 - 12 answers

Dear math people: please help me understand fractions and ratios *intuitively*. [more inside]

posted by*anonymous*
on Jun 19, 2013 -
29 answers

posted by

In high school maths exams students when use Mathematica to solve problems, a syntax error that costs a lot of time to find can lose a student a lot of marks. What strategies can teachers use to reduce the risk or cost of syntax errors to students sitting high-stakes exams? [more inside]

posted by kandinski on Jun 12, 2013 - 7 answers

posted by kandinski on Jun 12, 2013 - 7 answers

I've recently decided to transition to a new career path, accounting. Most firms round here do an online numeracy test as part of the application process.
There is a type of % change question that often comes up and I can't find a proper answer about how to calculate it.
There are two formulae suggested by different websites, but they give different answers. Which is right? (details inside) [more inside]

posted by NoiselessPenguin on May 28, 2013 - 10 answers

posted by NoiselessPenguin on May 28, 2013 - 10 answers

Dear Mefites, a long time ago I got a degree in graphic design but never worked in the industry. Along the way I somehow (don't remember how or why or when) became interested in math and I finished a graduate diploma in maths as a distance learning course in my free time. I am considering applying for masters programmes in maths or related subjects but ... can I? Should I? [more inside]

posted by Cat Set Go on Mar 31, 2013 - 10 answers

posted by Cat Set Go on Mar 31, 2013 - 10 answers

Mathematics-filter: If there are seven funds with various charges, how can I work out the allocation to these funds of a fixed amount so that the weighted mean charge is below a certain level and the allocations are of similar sizes? [more inside]

posted by djgh on Dec 31, 2012 - 13 answers

posted by djgh on Dec 31, 2012 - 13 answers

Can you think of a method that allows an individual to pseudo randomly create a sequence of numbers (at the very least the randomness is opaque to the minds of other people) assuming said individual may only use his mind and body (no physical tools are allowed)? [more inside]

posted by Foci for Analysis on Dec 21, 2012 - 7 answers

posted by Foci for Analysis on Dec 21, 2012 - 7 answers

A colleague alluded to a passage from Sherlock Holmes where all the evidence is re-written as formal logic propositions, leading to a mathematical solution that matches Holmes' solution (and is far from trivial). Does anyone else know where I could find this passage? [more inside]

posted by Anon Ymous on Dec 12, 2012 - 11 answers

posted by Anon Ymous on Dec 12, 2012 - 11 answers

Say that I have a bag which contains 100 balls and every ball in the bag should be red, but it's possible that one or more of these balls is the wrong colour. How many balls should I look at to be 90% sure that all the balls are red? Or 95%? Or 99.9%? Talk me through how to work this out, please?

posted by xchmp on Nov 12, 2012 - 14 answers

posted by xchmp on Nov 12, 2012 - 14 answers

I know the price of something now and what the price was 2 years ago - how do I calculate that as an annual percentage increase? [more inside]

posted by jontyjago on Oct 19, 2012 - 12 answers

posted by jontyjago on Oct 19, 2012 - 12 answers

Is there any place on Earth that gets the most moonlight? [more inside]

posted by zinful on Oct 6, 2012 - 7 answers

posted by zinful on Oct 6, 2012 - 7 answers

I'm looking to learn how to calculate probabilities for a multi-round dice game. I've researched this question some, and it looks like I might need to know how to use the multinomial distribution, but I can't find any good introductions. Please point me to the most layman-accessible educational material on this subject, and help me to help myself. [more inside]

posted by Richard Daly on Sep 28, 2012 - 6 answers

posted by Richard Daly on Sep 28, 2012 - 6 answers

Maths (math) people of the US: I need your help in working out if certain British conventions would be understood or standard in the US classroom. [more inside]

posted by cincinnatus c on Jul 10, 2012 - 15 answers

posted by cincinnatus c on Jul 10, 2012 - 15 answers

After tens of thousands of games of pool, every time I rack the balls I seem to switch about half of them around. I know I'm wasting time. So, I want to know exactly how many balls I should *normally* expect to swap (the median), and what is the most I should *ever have* to swap. For those of you who aren't pool nerds like me, I've explained the 8-ball racking process inside. [more inside]

posted by omnigut on Apr 4, 2012 - 19 answers

posted by omnigut on Apr 4, 2012 - 19 answers

What is the difference between floating point accuracy and precision?

posted by conrad101 on Jan 2, 2012 - 10 answers

posted by conrad101 on Jan 2, 2012 - 10 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

Can you cite any examples where a technological breakthrough wasn't possible until there was some sort of mathematical breakthrough? [more inside]

posted by Brian Puccio on Apr 6, 2011 - 32 answers

posted by Brian Puccio on Apr 6, 2011 - 32 answers

Help me understand the efficacy of a headbutt as an offensive opening gambit in a bout of fisticuffs... [more inside]

posted by dougrayrankin on Feb 24, 2011 - 27 answers

posted by dougrayrankin on Feb 24, 2011 - 27 answers

Need help from Math and IT geeks :-)
Long question inside. [more inside]

posted by WizKid on Feb 14, 2011 - 20 answers

posted by WizKid on Feb 14, 2011 - 20 answers

Which probability distribution should I use to model examination results? [more inside]

posted by alby on Jan 13, 2011 - 13 answers

posted by alby on Jan 13, 2011 - 13 answers

Maths-filter: please recommend some good resources (books, sites, software) for learning about numerical simulations of large (like 20+ dimensional) dynamical systems, especially in continuous time. [more inside]

posted by moorooka on Dec 21, 2010 - 3 answers

posted by moorooka on Dec 21, 2010 - 3 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

Statistics! I need to use them at work, but over the past few years numbers seem to make my head spin. Any tips for parsing them? Any recommended books for someone who only scraped a C at GCSE Maths? [more inside]

posted by mippy on Oct 20, 2010 - 6 answers

posted by mippy on Oct 20, 2010 - 6 answers

How do I reduce something by -800% when I'm working with a scale between -99% and 99%? [more inside]

posted by tunestunes on Sep 13, 2010 - 15 answers

posted by tunestunes on Sep 13, 2010 - 15 answers

Help! I need (in a hurry) to put my matlab images into a latex document. I'm exporting them as eps files, but when I put them in the latex file, all the text (legends and axis labels) have vanished. I can't find a solution on google. I can't use jpg instead because it looks crap. Why is the text in my eps file not showing up??

posted by moorooka on Sep 7, 2010 - 8 answers

posted by moorooka on Sep 7, 2010 - 8 answers

Where can I find a proof for the strong order of convergence of the Euler-Maruyama or Milstein schemes used to model stochastic differential equations?

posted by moorooka on Aug 29, 2010 - 4 answers

posted by moorooka on Aug 29, 2010 - 4 answers

Can someone help me with a maths problem please, how to find y for a given x on a curve? [more inside]

posted by zingzangzung on Aug 26, 2010 - 14 answers

posted by zingzangzung on Aug 26, 2010 - 14 answers

If I multiply 1¢ by 10¢ I get 10¢? However, if I use the same monetary amounts and express them as dollars and then multiply them: I get $0.01 * $0.10 = $0.001, which is obviously a different answer to 10¢.
I know this is wrong and but how and why?

posted by therubettes on Jul 26, 2010 - 18 answers

posted by therubettes on Jul 26, 2010 - 18 answers

I am looking for games/mental activities you can play with nothing but your mind. [more inside]

posted by therubettes on Jun 26, 2010 - 27 answers

posted by therubettes on Jun 26, 2010 - 27 answers

I have a list of 6 items. I need to make a list of unique combinations where 3 items are taken from the list in any order and the 4th item is also taken from the same list but cannot be one of the 3 items already selected [more inside]

posted by missmagenta on Jun 18, 2010 - 13 answers

posted by missmagenta on Jun 18, 2010 - 13 answers

I have a list of 10 questions to help prepare for an exam. Of these 10 questions, 6 will be selected for the exam paper. Of the 6 on the exam paper I need to choose 3 to write an essay on. How many do I ACTUALLY need to research to be okay on the day? [more inside]

posted by nothing too obvious on Jun 10, 2010 - 8 answers

posted by nothing too obvious on Jun 10, 2010 - 8 answers

I'm trying to find a website that teaches vector mathematics in lesson form. [more inside]

posted by giggleknickers on May 3, 2010 - 2 answers

posted by giggleknickers on May 3, 2010 - 2 answers

Wolframm's "A New Kind of Science" is a very thick book that would require a significant investment of time to read through. I'm interested in the computational modeling of complex adaptive systems and have heard it recommended as an interesting read. I've also seen it described as a huge load of crap. Is it worth the bother?

posted by moorooka on Mar 28, 2010 - 12 answers

posted by moorooka on Mar 28, 2010 - 12 answers

Can someone help me get high-res scans of Ramanujan's notebooks? [more inside]

posted by wemayfreeze on Mar 26, 2010 - 6 answers

posted by wemayfreeze on Mar 26, 2010 - 6 answers

What is the next step of this Kenken? [more inside]

posted by johnofjack on Jan 30, 2010 - 23 answers

posted by johnofjack on Jan 30, 2010 - 23 answers

Please explain *what* calculus is to a dummy. [more inside]

posted by Sova on Jan 17, 2010 - 48 answers

posted by Sova on Jan 17, 2010 - 48 answers

Help with a Martin Gardner maths riddle, please! [more inside]

posted by laumry on Jan 16, 2010 - 20 answers

posted by laumry on Jan 16, 2010 - 20 answers

How do you animate a parameter in the OSX Grapher utility? [more inside]

posted by b1tr0t on Nov 1, 2009 - 3 answers

posted by b1tr0t on Nov 1, 2009 - 3 answers

I've annoyed myself by getting stuck attempting to work out a silly maths problem relating to permutations. It's an extension of the 'how many odd socks do I have to pull out of a drawer before I find a pair' problem. Only my theoretical sock-wearer has three legs. And a penchant for odd socks. [more inside]

posted by Beautiful Screaming Lady on Sep 1, 2009 - 7 answers

posted by Beautiful Screaming Lady on Sep 1, 2009 - 7 answers

Ive been tearing my hair out trying to work out a mathematical formula for a sequence of numbers I have. Have a look inside and tell me if you see a pattern. [more inside]

posted by phyle on Aug 16, 2009 - 18 answers

posted by phyle on Aug 16, 2009 - 18 answers

If something takes 2 hours to complete and is then re-run and takes only 1 hour ... is that 100% quicker or 50% quicker? [more inside]

posted by cantthinkofone on Aug 13, 2009 - 73 answers

posted by cantthinkofone on Aug 13, 2009 - 73 answers

When did "Maths" change to "Math" in American English? Or is it the other way around? [more inside]

posted by fishmasta on Jul 11, 2009 - 39 answers

posted by fishmasta on Jul 11, 2009 - 39 answers

Optimisation problem: trying to find the subset of my data that meets a couple of constraints. [more inside]

posted by muhonnin on Jun 14, 2009 - 18 answers

posted by muhonnin on Jun 14, 2009 - 18 answers

I am trying to fit my data onto a sigmoidal function. The fit won't be perfect, but I am stuck with it for now.
To help with this, I have been (very generously) given a spreadsheet that creates a sigmoidal curve if the values a, b, x0 and x are known. How do I get these values? [more inside]

posted by doctor.dan on May 24, 2009 - 8 answers

posted by doctor.dan on May 24, 2009 - 8 answers

Interested to know more about the 'numbers' in JS Bach's music. Sometime ago I heard a radio programme about how some of Bachs music had patterns in which could be viewed as significant outside of what the music sounded like. [more inside]

posted by southof40 on Apr 13, 2009 - 10 answers

posted by southof40 on Apr 13, 2009 - 10 answers

Best books, websites, lecture series on game theory and its applications for smart people who understand mathematics but can't stand trawling through pages of unnecessary complex formulae?

posted by vizsla on Jan 26, 2009 - 8 answers

posted by vizsla on Jan 26, 2009 - 8 answers

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