A baseball diamond is 90 feet square, and the pitcher's mound is at the center of the square (which isn't really true, but pretend it is). If a pitcher throws a baseball at 90 miles per hour, how fast is the distance between the ball and first base changing as the ball crosses home plate? (Note: 1mph = 22/15 feet/s.)

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.