document.write( "Question 49912This question is from textbook Beginning Algebra
\n" ); document.write( ": I believe this is supposed to be solved by using the quadratic equation, but I'm not sure how to work it. Any help would be very much appreciated!!\r
\n" ); document.write( "\n" ); document.write( "If a pebble is dropped toward a pond from the top of a 240-ft building, its height h after t s is given by h = 16t^2 + 240. How long does it take the pebble to pass through a height of 120 ft? \n" ); document.write( "
Algebra.Com's Answer #33166 by AnlytcPhil(1807)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "I believe this is supposed to be solved by using the quadratic equation,\r\n" );
document.write( "but I'm not sure how to work it. Any help would be very much \r\n" );
document.write( "appreciated!! If a pebble is dropped toward a pond from the top of a \r\n" );
document.write( "240-ft building, its height h after t s is given by h = 16t^2 + 240. How \r\n" );
document.write( "long does it take the pebble to pass through a height of 120 ft?\r\n" );
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document.write( "That formula is wrong. It should be h = -16tē + 240.  \r\n" );
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document.write( "Just plug 150 for h in the equation and solve first for tē. Then take\r\n" );
document.write( "square roots of both sides.  You'll get approximately t = 2.7 seconds.\r\n" );
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document.write( "Edwin
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