## Help me figure out this number-of-combinations problem

Supposing you have a set of N number of questions to choose from for creating a test. Your test must have a minimum of 1 question but can have all N. How many unique tests could you create? Am I correct to assume the formula is 64! (factorial)? 64 x 63 x 62 x 61...
posted by postergeist on Feb 13, 2016 - 6 answers

## How do I solve for a percentage of a total budget...

This will be easy for someone, but math is my second language so I'm at a loss. How do I solve for the percentage of a TOTAL budget, when one line item is unknown (and is part of the total budget)?
posted by coollibrarian on Dec 9, 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.
posted by moira on May 10, 2014 - 6 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

## If I Knew the Answer, I Could Probably Give the Question a Good Title

Is there a formula for determining (eg.) how many tracks would fit on a TT 79:57 CDR where the first track was one second, and subsequent tracks added 1 second each? (00:01, 00:02, 00:03, 00:04, &c)
posted by herbplarfegan on Dec 10, 2012 - 7 answers

## Turning user input into pie (charts)

WordPressFilter: I'm looking for a plugin/widget/codesnippet that will allow me to create a graph using input from the user.
posted by antonymous on Nov 27, 2012 - 5 answers

## What does a bivariate cubic polynomial look like?

What does a bivariate cubic polynomial look like?
posted by tybeet on Jul 13, 2011 - 9 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".
posted by attercoppe on May 15, 2011 - 33 answers

## Formula for figuring poker winnings

I need help untangling a formula for tracking poker winnings. All this math is making my head hurt! Totally legal details within.
posted by c:\awesome on Oct 7, 2010 - 8 answers

## Reverse my percentage?

How do you find a number that minus a percentage of itself is a certain number?
posted by JulianDay on Dec 6, 2009 - 7 answers

## Help, Please - I'm an Excel Moron

I have to create an excel sheet to keep track of a book budget - in the most basic terms, I will have a total budget figure, and I want to subtract invoice figures to keep a running total. Here's an example of what I want the sheet to look like: http://i109.photobucket.com/albums/n46/coollibrarian/excel.jpg The simpler the better.
posted by coollibrarian on Jul 26, 2008 - 7 answers

## Formulas for Food

Looking for math formulas involving food.
posted by JaySunSee on Aug 4, 2007 - 5 answers

## Where can I find fomulas for calculating coordinating colors?

Where can I find mathematical fomulas for calculating coordinating colors for interior decorating projects?
posted by Vorteks on Oct 20, 2006 - 10 answers

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