document.write( "Question 1173412: The height $\"highlight%28in_feet%29\"$ of a ball above the ground t seconds after it is thrown is h(t) = 20+32t−16t2. How long will it take for the ball to hit the ground? \n" ); document.write( "

Algebra.Com's Answer #798615 by ikleyn(52778) $\"\"$ $\"About$

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document.write( "To answer the problem's question, you need to solve this equation\r\n" );
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document.write( "    -16t^2 + 32t + 20 = 0\r\n" );
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document.write( "and take its larger root.\r\n" );
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document.write( "The equation is equivalent to\r\n" );
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document.write( "    4t^2 - 8t - 5 = 0\r\n" );
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document.write( "Use the quadratic formula\r\n" );
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document.write( "    t =  =  = .\r\n" );
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document.write( "The larger root is   =  = 2.5 seconds.\r\n" );
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document.write( "ANSWER.  The ball will hit the ground in 2.5 seconds.\r\n" );
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