15. The path of a basketball thrown into the air is modeled by the equation
y=-0.2x²+x+6, where y represents the vertical distance the ball travels and x represents
the horizontal distance the ball travels. Find the maximum height of the basketball to
the nearest tenth of a foot.
A. 7.3 ft
B. 4.3 ft
C. 8.5 ft
D. 6 ft