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

Math/Physics Question: Stability of an abruptly stopped object

If you have an object with a given base length and a given CG height, how fast can it travel before you have to worry about it running over an obstacle and falling over?
posted by Popular Ethics on Mar 5, 2013 - 16 answers

Perspective drawing calculation

If I want to draw something in one-point perspective, say, like a set of railroad tracks where the vanishing point is on the horizon, and the tracks are represented on the picture plane by an equilateral triangle (they appear that way to the viewer), the apex of the triangle being the vanishing point on the horizon and the base of the triangle is where the tracks meet the picture plane, how do I calculate where the railroad ties would be? (Given that in 3D they are evenly spaced. Also, I'm not really concerned with the thickness of the ties -- we can consider the ties to simply be horizontal lines.)
posted by strangeguitars on Jan 8, 2013 - 5 answers

Math Geeks!! Assistance needed!!

How should a surcharge be calculated?
posted by elf27 on Jun 7, 2012 - 11 answers

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

What would the check-digit be on this string: K1506235620?
posted by JPigford on Sep 12, 2011 - 6 answers

Figuring interest at a per-month rate, compounded monthly

Mathfilter: How do I figure the total value of interest at a per-month rate, compounded monthly, with monthly contributions?
posted by AV on Jun 9, 2010 - 17 answers

"I'll Calcu Later!"

I've seen people compute complex arithmetic off the top of their head. How do they do it?
posted by Christ, what an asshole on Apr 30, 2009 - 13 answers

creating circles from rectangles

Math filter: How many equally sized rectangles will fit into a circle, and how should I arrange them in order to make the best-looking approximation?
posted by brandnew on Aug 17, 2008 - 9 answers

calories and acting

Myth or truth?: You burn as many calories playing a major theatrical role (i.e. "Hamlet") as you do running a marathon. And how DO you calculate calories, anyway?
posted by grumblebee on Jul 8, 2005 - 20 answers

How does my pocket calculator do this?

How does my pocket calculator do this?
posted by Termite on Mar 28, 2004 - 6 answers

Page: 1