After stopping at a gas station, a car begins to move and get back onto the highway. The function f gives the distance in feet of the car from the gas station as a function of t, the number of minutes since the car left the gas station, and f(t)=0.25t2+7t. What is the average speed of the car as it travels during the time interval from 1.9  minutes to 2.1  minutes after leaving the gas station?

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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.