Can someone help me with this. Will Mark brainliest. Answer and explanation needed. Thanks

Aportion of a line bounded by two points is defined as

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 pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?