DESPERATE! NEED HELP

A football player is practicing kicking field goals with the ball on the 25 yard line (105ft from the goalposts). If you imagine a coordinate system with the ball being kicked at d=0 and the goal post at d=105, then the equation of the ball's path is h(d)=-1/90(d-60)^2 + 40 where h is the ball's height in feet.

A. What is the maximum height of the ball
B. What will the height of the ball be when it reaches the goal-post crossbar which is 10ft above the ground.

I think I was supposed to use a graphing calculator for this... but I don't have one.

Question

DESPERATE! NEED HELP

A football player is practicing kicking field goals with the ball on the 25 yard line (105ft from the goalposts). If you imagine a coordinate system with the ball being kicked at d=0 and the goal post at d=105, then the equation of the ball's path is h(d)=-1/90(d-60)^2 + 40 where h is the ball's height in feet.

A. What is the maximum height of the ball
B. What will the height of the ball be when it reaches the goal-post crossbar which is 10ft above the ground.

I think I was supposed to use a graphing calculator for this... but I don't have one.

anonymous · Answer

@Kainui please help me out if you have time

kainui · Answer

Draw out a picture, and label as much as you can and I'll help you out. =)

anonymous · Answer

$$h(d)-1/90(d-60)^{2}+40$$ |dw:1397712761150:dw| @Kainui

anonymous · Answer

@sourwing @kirbykirby @wolf1728