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32 posts tagged with calculation.

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## Volunteered to add up the votes for my Book Club; No idea how to do it

This year my Book Club decided to vote on the books we'll read all at once instead of month-by-month. There are 17 books choose from in total and I gave each person a sheet with the books in alpha order. I then asked them to order the books by preference – i.e., their first choice is #1, their second #2 etc. [more inside]

## 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. [more inside]

## How do i determine the wall thickness of a Cylinder if it gets expanded.

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]

## 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? [more inside]

## Can someone explain how IRA early withdrawal penalties are calculated?

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]

## 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.) [more inside]

## Help me improve the ASA fitness classification system

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]

## Math Geeks!! Assistance needed!!

How should a surcharge be calculated? [more inside]

## Calculate Electric Cost

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?

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

## Tell me I'm not cheap!

Do you calculate your waiter's tip based on the pre-tax or the with-tax total? [more inside]

## Shipping charges

Online payment system with integrated shipping charges calculator? [more inside]

## What do you call similarity calculation?

what do you call the science/math for calculating similarity between people based on survey results (like OK Cupid)? [more inside]

## mySql query assistance, please!

mySQL query question about calculating percentages in a table. [more inside]

## 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? [more inside]

## Birth year confusion

Can I conclusively determine a birth year from these two data points? [more inside]

## What is a Fair Interest Rate for Money Loved Ones Lent You With No Interest Rate Specified?

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'll Calcu Later!"

I've seen people compute complex arithmetic off the top of their head. How do they do it? [more inside]

## Math question

Math problem with shipping rates. Can a maths whiz point me in the right direction? [more inside]

## Need an instant quote web form that instantly calculates quotes!

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]

## Yet another excel question!

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]

## 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? [more inside]

## Old Car: How to decide on repair vs. replace?

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]

## Using a Database for analysis of temperatures

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 GPP on goods sold?

How do I calculate Gross Profit Percentage (GPP) on goods I sell? [more inside]

## Excel master needed...where to find one?

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.

## drill press force multiplier?

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 the energy cost of an electronic device over a span of time be calculated?

## Calculate ambient light level?

How can I calculate the ambient (natural) light level for a particular location and time? [more inside]

## 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? [more inside]

## How does my pocket calculator do this?

How does my pocket calculator do this? [more inside]

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