You throw a ball straight up from a rooftop 70 feet high with an initial speed of 80

feet per second. The functions s(t)=â16t2+80t+70models theâ ball's height above theâ ground,s(t)

inâ feet, t seconds after it was thrown. During which time period will theâ ball's height exceed that of theâ rooftop?

When will the ball exceed the height of theâ rooftop?