jins is going to throw a balll from the balcony of her condo. When she throws the ball from 80 feet above the ground, the function

h(t)= -16t² +64t+ 80 models the height, h, of the ball above the ground as a function of time, t.

find

a( the zeros of this function which tells us when the ball will hit the ground

b) the time(s) the ball will be 128 feet above the ground

c) the height the ball will be at t= 4 seconds