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OpenStudy (anonymous):
A rocket is launched from the top of an 80 foot cliff with an initial velocity of 110 feet per second. The height, h, of the rocket after t seconds is given by the equation h=-16t^2+110t+80. How long after the rocket is launched will it be 20 feet from the ground?
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OpenStudy (anonymous):
7.38s
OpenStudy (anonymous):
Substitute 20 for h. Then solve for t.
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