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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]
posted by JPigford on Sep 12, 2011 - 6 answers

Probability Question

Probability Question [more inside]
posted by nickhb on Sep 3, 2011 - 15 answers

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]
posted by foursentences on Aug 30, 2011 - 89 answers

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]
posted by disillusioned on Aug 26, 2011 - 2 answers

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]
posted by richyoung on Aug 24, 2011 - 10 answers

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]
posted by joshrholloway on Aug 23, 2011 - 80 answers

I'm a rank amateur

What are some basic math concepts I can use to understand and develop a ranking system? [more inside]
posted by rhizome on Jul 26, 2011 - 7 answers

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!
posted by mathmatters on Jul 21, 2011 - 16 answers

Math ties?

Any good math or physics neckties? [more inside]
posted by jeffburdges on Jul 20, 2011 - 13 answers

Divide it amongst yourselves II

"the average number of molecules in a rock band" [more inside]
posted by Leon on Jul 18, 2011 - 12 answers

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?
posted by gzimmer on Jul 15, 2011 - 14 answers

What does a bivariate cubic polynomial look like?

What does a bivariate cubic polynomial look like? [more inside]
posted by tybeet on Jul 13, 2011 - 9 answers

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?
posted by strangeguitars on Jul 3, 2011 - 33 answers

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]
posted by thebazilist on Jul 1, 2011 - 7 answers

Need help with a probability question

Can someone help with a probability question? [more inside]
posted by caroljean63 on Jun 25, 2011 - 22 answers

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]
posted by lakeroon on Jun 22, 2011 - 12 answers

Calculus? Is that it?

Why can't I read this? And what sort of classes would I need to make sense of this? [more inside]
posted by Tennyson D'San on Jun 21, 2011 - 12 answers

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]
posted by mecran01 on Jun 21, 2011 - 25 answers

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]
posted by bondcliff on Jun 8, 2011 - 42 answers

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]
posted by Ideal Impulse on Jun 5, 2011 - 6 answers

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]
posted by Pontifex on Jun 3, 2011 - 8 answers

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]
posted by dejah420 on Jun 2, 2011 - 20 answers

Hidden Markov Models for idiots?

Biologist needs recommendations on where to start learning the basics of HMMs. [more inside]
posted by Hutch on Jun 2, 2011 - 4 answers

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]
posted by desjardins on May 26, 2011 - 15 answers

Being able to point out the idiocy of math tattoos

How do I pick up mathematics...as an amateur hobby? [more inside]
posted by hal_c_on on May 22, 2011 - 21 answers

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]
posted by attercoppe on May 15, 2011 - 33 answers

How do I learn math for CLEP?

Help me learn math for my CLEP test, please. [more inside]
posted by 3dd on May 15, 2011 - 10 answers

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]
posted by Theta States on May 12, 2011 - 1 answer

cool math-y gifts?

I'm looking for an awesome, tactile, mathy gift for a friend of mine. Suggestions? [more inside]
posted by kaibutsu on May 12, 2011 - 27 answers

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?
posted by aunt_winnifred on Apr 14, 2011 - 6 answers

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

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]
posted by Earl the Polliwog on Apr 4, 2011 - 6 answers

Lengthening your horizons.

How close is the horizon on the moon? On Mercury? On Mars? [more inside]
posted by curious nu on Apr 4, 2011 - 3 answers

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]
posted by unixrat on Mar 25, 2011 - 11 answers

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]
posted by edgeways on Mar 24, 2011 - 14 answers

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]
posted by slide on Mar 23, 2011 - 9 answers

"New" math?

Multiple students taking an exam at different times come up with the same baffling answer. Help! [more inside]
posted by King Bee on Mar 21, 2011 - 24 answers

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]
posted by marble on Mar 18, 2011 - 13 answers

What the heck is an imaginary exponent?

What does it mean to raise a number to an imaginary power? [more inside]
posted by slappy_pinchbottom on Mar 16, 2011 - 29 answers

Strong Induction

Hey all, just a real quick discrete math induction question inside for anyone willing to help, thanks. [more inside]
posted by Benzle on Mar 14, 2011 - 7 answers

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]
posted by ScarletPumpernickel on Mar 13, 2011 - 10 answers

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]
posted by xenophile on Mar 9, 2011 - 17 answers

math finance text?

Any recommendations for a good graduate level text book for an introduction to mathematical finance course? [more inside]
posted by jeffburdges on Mar 8, 2011 - 1 answer

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?
posted by TheCoug on Mar 5, 2011 - 15 answers

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!
posted by EricBrotto on Mar 1, 2011 - 6 answers

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]
posted by Wanderboy on Feb 23, 2011 - 47 answers

WidgetFilter

If I know the number of widgets, number of days, and total budget, can I break down a per widget price? [more inside]
posted by pencroft on Feb 22, 2011 - 10 answers

How much extra salt?

Chemistry, math nerds, and smart people please help me with this cooking question involving salt. [more inside]
posted by anonymous on Feb 20, 2011 - 13 answers

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]
posted by reenka on Feb 10, 2011 - 31 answers

I Need All the Help Ever: Calculus Edition

Help me arm myself for a future-determining showdown with calculus. [more inside]
posted by geneva uswazi on Feb 10, 2011 - 28 answers

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