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A stone is thrown straight up from the roof of a 384-foot building.  The distance of the...

  1. A stone is thrown straight up from the roof of a 384-foot building.  The distance of the stone from the ground (in feet) at any time t (in seconds) is given by h(t)=-16t^2+80t+384

a).  When is the stone rising

b).  If the stone were to miss the building, when would it hit the ground?

c).  When is it falling?

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