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OpenStudy (anonymous):
.....height, h, in feet after t seconds is given by h(t)=-16t^2+24t+5. During what time interval (to the nearest tenth of a second) is the height of the ball greater than 9 ft.?
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sam (.sam.):
You can post this in the math section http://openstudy.com/study#/groups/Mathematics , there are more helpful people there
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