document.write( "Question 1173200: please help me \r
\n" ); document.write( "\n" ); document.write( "A ball is thrown from an initial height of 5 feet with an initial upward velocity of 21 ft/s. The ball's height h (in feet) after t seconds is given by the following.\r
\n" ); document.write( "\n" ); document.write( " $\"+h=5%2B21t-16t%5E2+\"$ \r
\n" ); document.write( "\n" ); document.write( "Find all values of t for which the ball's height is 11 feet.
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Algebra.Com's Answer #798376 by ikleyn(52803) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "To find these values of \"t\", solve the equation\r\n" );
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document.write( "    5 + 21t - 16t^2 = 11   feet.\r\n" );
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document.write( "Reduce it to the standard form\r\n" );
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document.write( "    16t^2 - 21t + 6 = 0.\r\n" );
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document.write( "Use the quadratic formula.\r\n" );
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