Iknow how do it but at the same time not really e, f,g, h

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.

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price