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896 posts tagged with math.

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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]

## Math Careers

Non-obvious careers for someone with a B.S. in Applied Mathematics? [more inside]

## Math? College?

The best way to pursue my college goals given my situation. [more inside]

## 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.

## 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.

## Converting math to code

Wanting to code. Can't read calculus. Kinda stuck. Help? [more inside]

## 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]

## 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!## 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]

## 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.

## 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]

## 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]

## 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]

## 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]

## Pythagorean Theorem in the original Greek

I'm looking for a textual version of

*a*^{2}+*b*^{2}=*c*^{2}that is as old as possible, among all the Greek sources. [more inside]## 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]

## 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]

## 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]

## 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?

## 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}= r^{2}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]## 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?

## Article about Common Core math

Trying to find an article I read sometime in the last three months about Common Core math. [more inside]

## [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.

## 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]

## 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]

## 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]

## 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]

## 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]

## 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)

## 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)?

## 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]

## Well-written math

Which mathematicians write exceptionally well or exceptionally clearly? (Individual books or articles would also be acceptable.) [more inside]

## 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!

## Regarding the M in STEM

What are some of the newest methods being used these days to teach young children arithmetic? [more inside]

## Was Fifth Grade math always this hard?

Can you show us how to solve a math word problem? [more inside]

## 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]

## 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]

## Table top brainteaser puzzles

## 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?## 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]

## 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]

## Percentage Question

Help me understand percentages. [more inside]

## 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]

## What is the slowest-growing whole number sequence?

What is the slowest-growing non-repeating, non-trivial* whole number sequence? [more inside]

## 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.

## 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]

## 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?

## 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]

## 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]

## 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]