Math
posted by Jen .
A model rocket is shot straight up from the roof of a school. The height at any time t is approximated by the model h=t^2+3t+28, where h is the height in meters and t is the time in seconds. When does the rocket hit the ground?

Math 
Steve
it hits the ground when h=0
since h = (t4)(t7) when do you think that is?
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