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816 posts tagged with math.

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816 posts tagged with math.

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## What would the check-digit be on this string: K1506235620?

What would the check-digit be on this string: K1506235620? [more inside]

## Probability Question

Probability Question [more inside]

## Next step: solve in three dimensions

Calculusfilter. A man is led to the center of a valuable field which he does not own. He coats his feet in blue paint so that his path can be traced. At dawn he begins walking. At a randomly selected time he will be told to stop walking, whereupon he will walk in a perfectly straight line back to the starting point. Then he will be given all the land that has been circumscribed by his blue path. [more inside]

## Of cakes and counts

I run an online cake contest (link in profile) with a judging panel. Is my scoring methodology the most efficient/accurate? [more inside]

## Dusting Off the Ol' Slide Rule

What are the best math instructional sites, resources and (especially) tools for graphing and math visualization these days? [more inside]

## The shortest programming distance between one and infinity?

What is the shortest possible program (in any well-known programming language) that will count up indefinitely and display the output as it's counting? [more inside]

## I'm a rank amateur

What are some basic math concepts I can use to understand and develop a ranking system? [more inside]

## Linear Relationships in Real Life?

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!

## Math ties?

Any good math or physics neckties? [more inside]

## Divide it amongst yourselves II

## Seperating Interlocked Rings

Consider two rings that are intertwined. (These lie in 3-dimensional space, but when you draw it on paper it looks like a venn diagram.) In 3-dimensional space they cannot be unlinked. The questions is, if you had one more dimension, can you unlink them?

## What does a bivariate cubic polynomial look like?

What does a bivariate cubic polynomial look like? [more inside]

## Calculator in math class

When should calculators be used in math class? What are good criteria for determining if a calculator should be used on a given set of problems?

## For best fireworks viewing, please use Math.

I'd like to be able to watch the Macy's fireworks from my dad's roof on the Upper West Side. How can I figure out if I'll be able to see them? I have some variables, heights, distances, and video... [more inside]

## Need help with a probability question

Can someone help with a probability question? [more inside]

## Shouldn't a point estimate be the midpoint of its confidence interval?

Shouldn't a point estimate be in the center of its confidence interval? [more inside]

## Calculus? Is that it?

## Helping my daughter love math this summer

My ten-year-old daughter is entering the gifted and talented program and she is a little anxious about her math skills. [more inside]

## If an geeky child is traveling South at 839 MPH, and his nerdy dad is going North at...

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]

## Real Life Math

Real Life Math: How could raising everyone's grade on one quiz result in some people getting a lower grade average for all the quizzes for some students? [more inside]

## Help my fiancee find some math related work

My fiancee needs some work, preferably from home. Math background, no telephone calling. Any leads? [more inside]

## Avoiding the "summer slide"

Primary school gets out tomorrow. I know it is common for kids to have a "summer slide" where they forget a lot of what they've learned over the year. Recommend some fun math and science sites/projects/activities for elementary school age kids that will keep them refreshed and interested. [more inside]

## Hidden Markov Models for idiots?

Biologist needs recommendations on where to start learning the basics of HMMs. [more inside]

## Graduation gift for a math and geology nerd

I'm looking for a graduation gift for a math and geology nerd. My best friend just got dual bachelor's degrees. She's going to grad school for geophysics in the fall. I know approximately zero about her areas of study and would like to get her something nice. [more inside]

## Being able to point out the idiocy of math tattoos

How do I pick up mathematics...as an amateur hobby? [more inside]

## Does this tattoo equation mean to you what I mean it to?

Math and science geeks, does this fake equation make sense? 'delta' = c ... meaning "change is constant". [more inside]

## How do I learn math for CLEP?

Help me learn math for my CLEP test, please. [more inside]

## What statistical analysis of historical prices would be useful for a buyer?

What statistical analysis of historical prices would be useful for a buyer? [more inside]

## cool math-y gifts?

I'm looking for an awesome, tactile, mathy gift for a friend of mine. Suggestions? [more inside]

## Is this math impossible?

I do not know math. I have a number, and I want to backwards engineer that number so I can arrive at it by adding some unknown amount and 13% of that unknown amount. Is there any way to figure this out besides trial and error?

## Did Anyone Invent Some New Math Stuff So They Could Solve A Problem Which Then Lead To a Technological Breakthrough?

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

## From teaching to tech - updating resume and skills

I have a Master's in math, and would like to get a job in the tech industry or a laboratory, but my resume is very teaching-oriented. I would like tips on retooling it to make myself more attractive. I also have several months to improve my skills. [more inside]

## Lengthening your horizons.

How close is the horizon on the moon? On Mercury? On Mars? [more inside]

## How can I calculate a month/date delta?

Calendar math question: today is March 25, 2011. I found my old watch in a drawer and the time is still correct, but the watch date window says 13. Assuming the date window repeats 1 to 31 and that I always 'set' my watch correctly, what was the most recent month and year that I could have worn it? [more inside]

## math

Stupid math question:
How to solve (not trail and error) a problem set up like:
2x*3y=278
if
x+y=119
I am not sure what to call this type of problem so can not effectively google the steps. Not looking for an answer (per se) of the above problem, but the steps taken to solve it. [more inside]

## An infinite debate?

Got into a debate with a friend regarding a math question - I think our debate reflects his misapplication of finite math reasoning to infinities, but I'm having trouble dredging up what I learned in set theory 10 years ago. Imagine you have a bag that has all of the real numbers from 0 to 2, let's say. What are the odds that if you reach into the bag you pull out a number between 0 and 1.5 ? 75%? 50%? Why? Depending on the answer to this I may have followup questions, but I'll leave it here for now. [more inside]

## "New" math?

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

## What length to cut pipes for a xylophone?

Need help with some math: figuring out pipe lengths for a xylophone for my daughter's school project. [more inside]

## What the heck is an imaginary exponent?

## Strong Induction

Hey all, just a real quick discrete math induction question inside for anyone willing to help, thanks. [more inside]

## How to find focal length from image magnification % ?

Math/Optics: How can I derive the focal length of a lens from the magnification percentage of an image? [more inside]

## How to be analytically creative?

I have a poetic, creative, intuitive brain. I feel out of my element talking to programmers, mathematicians, and physicists, yet I find their ideas aesthetically intriguing and I want to understand them. [more inside]

## math finance text?

Any recommendations for a good graduate level text book for an introduction to mathematical finance course? [more inside]

## Pie is greater than not pie.

I'm trying to express my love for a certain dessert in a math/logic formula.
I have this:

**π > ∼π**, which I take to mean "Pi is greater than not Pi", and this:**π > ∞-π**, which I take to mean "Pi is greater than Everything but Pi". Do these make any sense or hold up in any legit way?## Game Theory Post Grad studies

Post grad studies in Game Theory? Which universities have a focus in Game Theory? Are there Masters available for this?
Sorry for the grunt like presentation to my question. I just thought the abbreviated style would be best for a summary review of what I'm looking for.
Thanks!

## How to manipulate "12 = x - (square root of x)" into "x="

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

## WidgetFilter

If I know the number of widgets, number of days, and total budget, can I break down a per widget price? [more inside]

## How much extra salt?

Chemistry, math nerds, and smart people please help me with this cooking question involving salt. [more inside]

## Should I pursue my interest and study college physics more?

Should I pursue my interest and study college physics more? Specifically, should I take a year-long calculus-based program, until I get comfortable that I'm on top of it-- and can really judge my level of interest and aptitude fairly?
Considering I'm a Junior English major. Also considering that it's been 15 years since HS algebra and I've never been good at math. But I want to be. [more inside]

## I Need All the Help Ever: Calculus Edition

Help me arm myself for a future-determining showdown with calculus. [more inside]