a rocket is fired into the air from the top a building. The equation H= -16t2 + 96t + 120 gives H, the height of the rocket in feet, t seconds after it was fired.
a) How tall was the building?
b) What was the maximum height of the rocket?
c) When did the rocket hit the ground?

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a) substitue t=0 into the equation.
b) dH/dt = 0

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