document.write( "Question 859113: Im a parent trying to help my daughter...basically the problem is a kid drops a rock from a bridge, h represents height and t represents time in seconds, how long does it take for the rock to hit the water from the bridge with the formula h= -16tē-16t+60 \n" ); document.write( "
Algebra.Com's Answer #517558 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
According to the equation for h, at t=0, the height, h, is 60. At what time t will h become zero?\r
\n" ); document.write( "\n" ); document.write( "You want \"h=-16t%5E2-16t%2B60=0\".\r
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\n" ); document.write( "\n" ); document.write( "You can use the general solution to a quadratic equation to avoid trying to factorize the quadratic expression; and you need to accept the POSITIVE value for t. \r
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\n" ); document.write( "\n" ); document.write( "Here is how that is setup but not showing the steps:
\n" ); document.write( "\"t=%2816%2B-+sqrt%2816%5E2-4%28-16%29%2860%29%29%29%2F%282%28-16%29%29\"
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\n" ); document.write( "\"highlight%28t=1.5%29\" or \"cross%28t=-2.5%29\"\r
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\n" ); document.write( "\n" ); document.write( "You COULD try to factor the quadratic expression - I began to try factoring but doing so brings up a few different trials to check; directly using the general solution is easier. \n" ); document.write( "
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