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4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100.

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

Math Careers

Non-obvious careers for someone with a B.S. in Applied Mathematics? [more inside]
posted by anonymous on Jul 22, 2014 - 21 answers

Math? College?

The best way to pursue my college goals given my situation. [more inside]
posted by mrdrummed on Jul 20, 2014 - 12 answers

Calculus Rabbit?

Is there a game like Math Rabbit out there, but for calculus? Specifically looking for something with lots of game-interface, not Khan Academy.
posted by curious nu on Jul 20, 2014 - 1 answer

what percent will result from combining two types of milk?

If I add 1/100 to 2/100, I get 3/100 or 3%. But if I add one hundred apples, one of which is red, to one hundred apples, two of which are red, I will have 3/200 or 1.5%. I'm very confused now as to what percent milk fat my milk will be if I combine the two types of milk (1% and 2%) together.
posted by windykites on Jul 16, 2014 - 15 answers

Converting math to code

Wanting to code. Can't read calculus. Kinda stuck. Help? [more inside]
posted by ericc on Jul 3, 2014 - 11 answers

Math Filter: What is Calculus?

My son would like to know: Is there more to calculus than functions, examples of functions, various formats for presenting functions, and so on? That is, does calculus have unique to it other tools that are not just variations on functions? [more inside]
posted by Michele in California on Jul 3, 2014 - 31 answers

Math book recommendations?

Years ago I read John Derbyshire's Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics and loved it. Now I'm studying formal theory/real analysis and I'm finding it really it interesting, but would like to be able to spend my downtime reading about the background of math and also explains some of the concepts. Thanks!
posted by MisantropicPainforest on Jun 24, 2014 - 13 answers

Maximum sum of numbers, one from each set, with constraints

Working on a personal project, I am running into a number of math problems of the kind described within. I am not a math expert, so I don't know what to call these kinds of problems, so I don't know how to search for information about them. [more inside]
posted by moonroof on Jun 23, 2014 - 11 answers

Help Me Learn Math!

I will be returning to school in the fall to start prerequisite courses for a Physical Therapy program. I don't know math. The last time i took math was in high school, and it was basic geometry. I would like to teach myself primarily, so that i can test into higher classes. The goal is to be able to test into pre-calc, so that i can also qualify for the physics classes as well. Any suggestions? I don't really care about the method. I was thinking about buying a textbook, but i was unsure of which ones to get. Thanks.
posted by hiddenknives on Jun 14, 2014 - 13 answers

Help Building a Gameplan For a Career In Market Research Analysis

So, I’ve been doing a lot of thinking about how to land a career in market research analysis. Below are the steps I’ve laid out for myself. Could you tell me if this is a good game plan to get where I want to go? [more inside]
posted by ggp88 on Jun 12, 2014 - 5 answers

Can you answer this question before my traffic court at 9 am?

I'm due in traffic court at 9 am. Help me use math to prove I didn't do it. [more inside]
posted by anastasiav on Jun 10, 2014 - 15 answers

2 problems of combinations and permutations.

How many unique ways are there to put X rocks into Y boxes? (Given two different sets of attributes for both the rocks and the boxes.) [more inside]
posted by CustooFintel on Jun 4, 2014 - 18 answers

Mortgage shenanigans?

We have an excessive interest rate on our home. We tried to refi, and the appraisal came in a good $40,000 less than it needed to in order to qualify. So some of our more numerically-talented friends ran some numbers for us in an attempt to find alternative solutions and found a weird discrepancy that makes it appear we owe $15,000 more on the loan than we do... [more inside]
posted by bitter-girl.com on May 13, 2014 - 13 answers

Pythagorean Theorem in the original Greek

I'm looking for a textual version of a2 + b2 = c2 that is as old as possible, among all the Greek sources. [more inside]
posted by benito.strauss on May 12, 2014 - 5 answers

How do I calculate combined percentages?

Mathfail: I'm considering supplementing my cat's food with plain meat. I'd like a rough idea of how much it would bump percentage of calories from protein and fat. [more inside]
posted by moira on May 10, 2014 - 6 answers

Should my math student have some Unix skills?

I think my son, who is on an AP math trajectory in high school, would benefit from getting some familiarity and basic programming skills in the Unix world. I've noticed math depts in some universities include study of these skills in early years. Are there some tutorials we could use in the OS X environment to get a leg up? [more inside]
posted by Mei's lost sandal on May 5, 2014 - 17 answers

What Major and Career Should I Look At If I Enjoy Math?

In studying for my Behavioral Statistics final (it’s a statistics class dealing with psychology research methods) I’ve realized something. I actually kind of enjoy math. As long as I don’t have to memorize formulas (as long as they are right there as I’m going through the work) it’s actually kind of comforting and fun. In fact, every math class I’ve taken in college (I’ve taken two remedial algebras, college algebra, and regular statistics before this class) I’ve enjoyed and made an A in. I’m really struggling about what I want to major in (I’m in psychology but I don’t have it in the gas tank to get a PhD), but I know that a lot of people don’t like math. They don’t get it. I do, so I’ve got something there, right? The only problem is, I don’t know what to do with it. These are the parameters… maybe you can think of something that fits? [more inside]
posted by ggp88 on May 4, 2014 - 16 answers

Size of earth to solar system vs drop of water to Mt Everest?

Can someone please tell me (if you could show calculations, that would be wonderful) what the ratio of ratios would be for these two numbers: a) the volume of the earth compared to that of the solar system and b) the volume of a drop of water compared to that of Mount Everest?
posted by shivohum on Apr 25, 2014 - 9 answers

Why is the center of a circle often given as (h, k)?

Why are the letters 'h' and 'k' often used to represent the center of a circle in the standard equation of a circle: (x - h)2 + (y - k)2 = r2 are 'h' and 'k' short for something? I might guess 'h' is short for 'horizontal', but I can't imagine what 'k' is for. [more inside]
posted by Reverend John on Apr 17, 2014 - 16 answers

What's a good topic for a one-hour math lecture?

I work as a math tutor at a community college and have the opportunity to spend an hour teaching math to a group of students preparing for a the college's math placement test. Now, I don't know what's on the placement test, but I want to teach something that's more engaging and conceptually accessible than "here's how to multiply (4x+3)(2x+5)", since I can't possibly review all of high-school math in an hour and don't think the students will get much from just another lecture. What are some interesting topics that I can explore that will be accessible and memorable?
posted by LSK on Apr 10, 2014 - 21 answers

Article about Common Core math

Trying to find an article I read sometime in the last three months about Common Core math. [more inside]
posted by Questolicious on Apr 5, 2014 - 7 answers

[MathFilter] Taking for-credit math classes online

For professional and academic reasons, I need to take a number of college-level math classes (mainly Calculus and Linear Algebra) in a relatively short period of time (4-6 months). They need to be online, for-credit, and I need to be able to do them at my own pace, meaning faster than a normal 1-course-per-semester flow. I've already found https://netmath.illinois.edu/, but the classes are terribly expensive, so I'd like to learn of other alternatives that don't cost as much.
posted by dcrocha on Apr 4, 2014 - 6 answers

Von Neumann I am not

I’ve spent my 20s building a BS “identity” as an “analytical type of person". Help me grow up. Snowflakes inside. [more inside]
posted by anonymous on Mar 29, 2014 - 10 answers

Calculus after being away from algebra for some time. Help me.

I am going to grad school in the fall. Hooray! Problem: I have to take calculus before I start and I am kind of freaking out. [more inside]
posted by The Pantless Wonder on Mar 24, 2014 - 24 answers

Chance of event with small sample size, based on larger related sample?

Can/how can one improve the estimate for a chance of an event with a small historical sample size by utilizing the chance of a related event with a large historical sample size? Example and half-assed guess inside. [more inside]
posted by Flunkie on Mar 20, 2014 - 16 answers

You Can't Handle the (Next) Proof!

Working through Apostol's Calculus Volume I for personal development. Stuck on a proof, again. Can you help? [more inside]
posted by bfranklin on Mar 18, 2014 - 6 answers

How to take scientific notes efficiently?

What is the best way to take grad level notes that feature tons of text, math equations and diagrams, during class, while reading books, and while reading research? Ability to search and organize a huge plus! Digital or non-digital solutions considered. [more inside]
posted by Riton on Mar 18, 2014 - 13 answers

In Need an Nerdy T-Shirt for Tomorrow (3.141592654...)

Okay, I'm in NYC and I need a PI related T-Shirt for Pi-Daytomorrow... Anyone know of any stores where I can get one? (It's too late for an online order)
posted by Stu-Pendous on Mar 13, 2014 - 11 answers

Why do we have order of operations in arithmetic?

Why do we have order of operations rules in arithmetic instead of just strictly evaluating expressions from left to right (possibly with parenthesis for grouping if we really wanted to change the order)?
posted by Reverend John on Mar 11, 2014 - 9 answers

Is this science or a sort of engineering? How do I learn more about it?

My ignorance of science and engineering concepts, procedures, and methods of calculation is holding me back from tackling a whole mess of fun stuff. But what fields am I even interested in, and how can I learn more? Where do I begin? [more inside]
posted by rue72 on Mar 4, 2014 - 11 answers

Well-written math

Which mathematicians write exceptionally well or exceptionally clearly? (Individual books or articles would also be acceptable.) [more inside]
posted by hoyland on Feb 28, 2014 - 19 answers

Where can I take an online linear algebra course this summer?

I have $800 for tuition reimbursement, and would like to take a linear algebra online course this summer. It doesn't matter if its for credit or not. Thanks!
posted by MisantropicPainforest on Feb 23, 2014 - 5 answers

Regarding the M in STEM

What are some of the newest methods being used these days to teach young children arithmetic? [more inside]
posted by Dansaman on Feb 10, 2014 - 3 answers

Was Fifth Grade math always this hard?

Can you show us how to solve a math word problem? [more inside]
posted by uncaken on Jan 28, 2014 - 27 answers

Singapore Math

I'm trying to help my 3rd grader with his math homework, but we are stuck on one problem. I can solve it using Algebra, but I'm trying to figure out how to explain it to him using the Singapore method that he's taught in school. Note that he hasn't learned how to add negative numbers, which puts a crimp on the methodology. [more inside]
posted by agog on Jan 27, 2014 - 7 answers

You Can't Handle the Proof!

Working through Apostol's Calculus Volume I for personal development. Stuck on a proof. Can you help? [more inside]
posted by bfranklin on Jan 25, 2014 - 7 answers

Table top brainteaser puzzles

Where can I find more good ideas for brainteaser puzzles like these? [more inside]
posted by klausman on Jan 17, 2014 - 3 answers

Why can't I differentiate this nomal/Guassian distrubution?

Have a look here. I'm assured that differentiating 1, with respect to x, gets you 2. Now 2 is - I think, and correct me if I'm wrong - equivalent to 3. The problem is I can't see how 3 is the result of differentiating 1. What's more, an online solver produces something (that looks) very different. Can someone help me out?
posted by ed\26h on Jan 17, 2014 - 9 answers

What to include in a training on maths for business people?

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

The Gambler's Fallacy, of course. But maybe...

A coin flips three times and comes up heads 2/3. Not suspect. But a coin flips 100,000 times and comes up heads 2 out of 3 times, that starts to look fishy. The standard probability of this is always roughly 50-50, but assuming a 2/3 ratio pointing to a "rigged" coin, how could you plot the increasing likelihood that a given coin is rigged? [more inside]
posted by ASoze on Jan 8, 2014 - 17 answers

Percentage Question

Help me understand percentages. [more inside]
posted by dbirchum on Dec 31, 2013 - 17 answers

Bad at math

I have a question about probability math. I am essentially flipping a coin (except instead of a 50/50 chance, my odds are 50.5% heads, 49.5% tails). I am concerned with the probability of me hitting heads (a 50.5% chance) several times in a row. [more inside]
posted by disillusioned on Dec 25, 2013 - 42 answers

What is the slowest-growing whole number sequence?

What is the slowest-growing non-repeating, non-trivial* whole number sequence? [more inside]
posted by Eideteker on Dec 11, 2013 - 24 answers

I need to be able to memorize several formulas for a test next week

I'm taking a numerical methods class and there are all these discretization schemes of partial differential equations named after pairs of dudes and they all are kinda the same, maybe a bit different in indexes.... I'm trying to organize it all in my head, like a frat house, with the dudes that worked on the same scheme being roommates, but it seems to be taking a long time to actually "find" a place for each scheme in their "rooms" and keeping it there in a sort of visual arrangement. Test is no books no notes, and everything kinda of just jumbles inside my head right now.
posted by spacefire on Dec 11, 2013 - 10 answers

Good Idea or Recipe For Hell?

I am going into my last semester of college, and I have signed up to take Calculus III, three years after taking Calc II. This may be a great idea or a terrible one. [more inside]
posted by DRoll on Dec 2, 2013 - 17 answers

Narrowing my son's grad school search

My son is a junior physics/math major at a small midwestern state university. He needs to start looking at graduate programs. He would prefer to stay in research or academia. How can I help him start this process? (B.S. for me) Location is not an issue. It's more a question of what programs offer the best opportunities and fields of study. How can we find out that kind of information? How can I help him start with a reasonable number of candidates?
posted by DaddyNewt on Nov 27, 2013 - 16 answers

Looking for a basic review of math (algebra, geometry, fractions, etc)

I have to take a math placement test in the next two weeks that will determine which college class I will place into next semester (January). I have already taken Math 1010 (Intermediate Algebra) and 1030 (Quantitative Reasoning) long ago but those credits do not count any longer towards this current placement. I need to test to see where I fall now. I'm hoping to get into Math 1050 (College Algebra) ideally. My skills are rusty though. [more inside]
posted by rabu on Nov 26, 2013 - 9 answers

Becoming Fluent in Predictive Analytics

I work in a University managing the broad based direct mail, email and calling programs. I have zero undergrad or graduate experience with math, business or the social sciences. (Aka, I can write a really nice essay...) I would like to chart a path to being recognized as an expert in predictive analytics. [more inside]
posted by meta x zen on Nov 26, 2013 - 3 answers

Career advice for math major (also competent programmer)?

I like math. Programming is OK, but I don't want to make it my thing. What careers should I be looking at? (Special snowflake details inside.) [more inside]
posted by sqrtofpi on Nov 25, 2013 - 15 answers

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