Question

Hello, I'd like to check if my answer is right.

I'll give a medal if someone helps :D

Here's the question:

A ball is thrown upward from the top of a building. The function below shows the height of the ball in relation to sea level, ft, in feet, at different times t in seconds:

f(t) = -16t^2 + 48t + 100

The average rate of change of f(t) from t = 3 seconds to t = 5 seconds is _____feet per second.

Answer 1

I'll type in my answer~