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09/21/2015

Math Help: Useful Formulas

Make sure to memorize these math formulas to help you advance faster with better understanding of your math material.

Probability

The probability (P) of an event occurring is measured as a fraction (between 0 and 1) with 1 being 100% probability and 0 being 0%. Take the number of desired outcomes and divide by the number of possible outcomes. For example, if you want to know the probability of rolling a 3 on a six-sided di, it is 1 (because there is only one 3) over 6 (because there are 6 possibilities). To find the probability two, mutually exclusive events both occurring, multiply their probabilities. If you want to know the probability of rolling a 3 and then a 4, you would multiply 1/6*1/6 for 1/36.

Midpoint Formula

When you need to find the midpoint of a line, use this formula to determine the coordinates.

Distance Formula

If you know your Pythagorean theorem , this equation will be intuitive. To determine the distance between two points, you can make a right triangle from them. square each side and then take the square root of the sum to obtain the length of the hypotenuse.

Cylinder Volume

The volume of a cylinder is the area of the circle that makes up its end times the height of the cylinder.

Average Speed

To find the average speed, use the formula distance over time.

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