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OpenStudy (anonymous):
A person standing close to the edge on the top of a 248-foot building throws a baseball vertically upward. The quadratic equation \qquad\qquad h = -16 t^2 + 128 t + 248 models the ball's height \, h \, above the ground in feet, t seconds after it was thrown. After 4 seconds the ball is 1016 ft in the air. How many seconds until the ball reaches the ground?
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