Answer:
10. (5,-10) and (2,-4)
11. The maximum height of the ball is 16 feet and it occurs 1 second after the ball is kicked.
Step-by-step explanation:
11. f(x)=-16x^2+32x
0=-16x^2+32x
0=x^2-2x
0=x(x-2)
f(x)=-16^2+32x
f(x)=-16 X (1)^2+32 X (1)
= -16+32
=16
