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

Area=lw
l is the length and w is the width. Multiply them together to find the area of a rectangle.
Perimeter=2l+2w
Double the length of each side and add the results together to calculate the perimeter.
Volume=lwh
h is the height of the rectangle. Multiply length, width, and height to find the volume.
### Find Percentages

To find x percent of a number (n),

To find what percent a number (n) is of another number (m),

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.
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