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building throws a ball vertically...

A person standing close to the edge on top of a 72-foot building throws a ball vertically upward. The Quadratic function h(t)= -16t^2+84t+72 models the balls height about the ground h(t), in feet, t seconds after it was thrownA) what is the maximum height of the ball? In feet?B)How many seconds does it take until the ball hits the ground?

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