The average rate of change over an interval, is a measure of how much the function changed per unit, on average, over that interval.
Since the function y = 15x represents the distance in feet, y, a ball flies in x seconds, the average of change for this function mean The average speed of the ball in feet per second between 2 and 5 seconds.
Answer:
b. The average speed of the ball in feet per second between 2 and 5 seconds.
