Question

On top of a hill, a rocket is launched from a distance 80 ft. above a lake. The rocket will fall into the lake after its engine burns out. The rockets height, h, in ft. above the suface of the lake, is given by the equation h=-16t^2+64t+80, where t is time in seconds. The maximume height of the rocket is ao feet

Answer 1

I think the time will be 8.