Question

The height y (in feet) of a ball thrown by a child is given by the equation y = -
1
9
x2 + 5x +3, where x is the horizontal distance (in feet) from the starting point. What is the maximum height of the ball?
A)
-165.75 ft
B)
-84.75 ft
C)
50.25 ft
D)
59.25 ft