math
posted by Anonymous .
A baseball is thrown straight up from the rooftop 192 feet high. The function s(t)=16t^2+64t+192 describes the ball's height above the ground,s(t), in feet, t seconds after it was thrown. How long will it take for the ball to hit the ground? Explain

math 
Reiny
Your equation does not make sense, things would be falling upwards
I think it should be
s(t) = 16t^2 + 64t + 192
we want 0 = 16t^2 + 64t + 192
t^2  t  12 = 0
(t4)(t+3) = 0
t = 4 or t = 3 , but t > 0
so t = 4 seconds
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