Can someone tell me a easy way how to solve this problem ?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

The function models the number of accidents