From a platform 35m above the gorund a ball is thrown upward with an initial speed of 30m/s. The approximate height of the ball above the ground t seocnds later is given by h (t)= 35 +30t-5t^2.

a) after how many secs does the ball hit the ground.

using -b/2a i got 6 secs.

b) what is the domain- using a grpahing calc i got -1<x>7

c) what is the range? I do not know how to do this. I would appreciate any help.