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OpenStudy (anonymous):
A person standing close to the edge on the top of a 309-foot building throws a baseball vertically upward. The quadratic equation h = -16 t^2 + 64 t + 309 models the ball's height, h, above the ground in feet, t seconds after it was thrown. How many seconds does it take until the ball finally hits the ground? Round to the nearest tenth of a second.
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