## Algebra and Trigonometry 10th Edition

$\frac{s(t_2)-s(t_1)}{t_2-t_1}=\frac{(-16(2)^2+36(2)+8)-(-16(0)^2+36(0)+8)}{2-0}=(16-8)/2=8/2=4$ On average, the ball moves 4 feet per second between t=0 and t=2.