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]
I would like to use a mathematical formula in Excel to try and determine how much the wall thickness of a Cylinder or tube changes if it is expanded. [more inside]
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? [more inside]
Everywhere mentions a 10% penalty, but nobody says whether this is pre or post tax, or whether it's added to your existing tax burden, or how these taxes actually get paid, etc. [more inside]
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.) [more inside]
The ASA physical status classification system is used by anaesthesiologists, surgeons and epidemiologists the world over. It has a major flaw - it makes no odds whether index patients have 1 or 5 systemic diseases: only the leading/worst is counted. This has the advantage of simplicity but is potentially misleading and should be done better in the 21st century. Numbercrunchers with a biomedical background needed ... [more inside]
How should a surcharge be calculated? [more inside]
How much does my refrigerator cost to run per month? The info tag on the inside reads; 110-127 VAC, 60 HZ, 11.2 AMPS. It runs 24/7 and my NYC electric is charged at .1999 per KWH. Including the calculation in your answer would be appreciated. Thanks.
What would the check-digit be on this string: K1506235620? [more inside]
Do you calculate your waiter's tip based on the pre-tax or the with-tax total? [more inside]
Online payment system with integrated shipping charges calculator? [more inside]
what do you call the science/math for calculating similarity between people based on survey results (like OK Cupid)? [more inside]
mySQL query question about calculating percentages in a table. [more inside]
Mathfilter: How do I figure the total value of interest at a per-month rate, compounded monthly, with monthly contributions? [more inside]
Can I conclusively determine a birth year from these two data points? [more inside]
Despite the lender explicitly loaning me something interest-free and with no firm repayment date, I would like to offer a fair interest rate when I am able to repay them in the future. I'd like your help in figuring out what that rate would be, and your confirmation that I am applying the concept of compound interest correctly. [more inside]
I've seen people compute complex arithmetic off the top of their head. How do they do it? [more inside]
Math problem with shipping rates. Can a maths whiz point me in the right direction? [more inside]
Does anyone know of a php script that can be used to easily generate a web form, and that can have a "calculation" box at the bottom, that will calculate a cost based on the previous response fields? [more inside]
I have an Excel question that I'm not sure how to search the archives for. [more inside]
What equation should I use to calculate the number of miles in a degree of longitude for a given latitude?
What equation can I use to calculate the number of miles in a degree of longitude for a given latitude? [more inside]
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? [more inside]
I drive a 1992 Toyota Camry with just over 203,000 miles on it. As far as I know, the car is in good mechanical condition except that the rear struts are in fairly desperate need of replacement. How do you calculate the payback period for repairing an old but paid-off car, and how might you use this information to help decide whether to repair the car or buy a newer used car? [more inside]
I've got an interesting question about MS Acess. It involves using lat/long data... Anyone care to help? [more inside]
How do I calculate Gross Profit Percentage (GPP) on goods I sell? [more inside]
I run a computer service. I have an issue that is a bit outside the bounds. I have a client who has been using an Excel spreadsheet to track his portfolio. It is pre-formatted for him to enter data and the formulas are all there. Just recently, it started calculating some things incorrectly. The person who originally set it up just passed away earlier this year. We need an Excel expert that can look at the file and don't know where to begin to find one. Checked the local community college but no dice. All ideas or pointers are appreciated.
Power Tool Filter: Is there some kind of 'force multiplier' in effect when using a drill press? i.e. when you put two pounds of pressure on the handle, is there more pressure applied to the work surface? Perhaps most importantly, how hard would this be to calculate? [more inside]
How can the energy cost of an electronic device over a span of time be calculated?
How can I calculate the ambient (natural) light level for a particular location and time? [more inside]
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? [more inside]
How does my pocket calculator do this? [more inside]