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OpenStudy (anonymous):
A person standing close to the edge on the top of a 390-foot building throws a baseball vertically upward. The quadratic equation is h=-16t^2+64t+390. How high is the ball after 2 seconds? How many seconds does it take for the ball to hit the ground?
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OpenStudy (amistre64):
well, since t stands for time .... let t=2
OpenStudy (amistre64):
other than that, how high is the ball when it is on the ground?
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