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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 -

    it hits the ground when h=0

    since h = (-t-4)(t-7) when do you think that is?

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