Asked by lem
                A girl stands on the edge of her dorm roof and throws a ball into the air. The ball's height above the ground after t seconds is given by h equals negative 16 t squared plus 64 t plus 80h=−16t2+64t+80. When will the ball hit the ground?
            
            
        Answers
                    Answered by
            Steve
            
    find t when h=0.
If you divide through by -16, then just solve
t^2 - 4t - 5 = 0
    
If you divide through by -16, then just solve
t^2 - 4t - 5 = 0
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