document.write( "Question 1138933: A plastic hoop is thrown upward from the top of a 168 foot high building at a speed of 88 feet per second. The plastic hoop's height above ground can be modeled by the equation Hbracket(t)=-16sup(t,2)+88t+168.\r
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Algebra.Com's Answer #756710 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "The correct answer is  t =  seconds.\r\n" );
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