document.write( "Question 1171206: Hitting a golf ball into a tower?
\n" ); document.write( "While on the golf course last weekend Marc
\n" ); document.write( "hit into the rough landing the ball behind a
\n" ); document.write( "tall tree. His best option was to get it high
\n" ); document.write( "enough to get over the tree and hopefully
\n" ); document.write( "come down in the fairway for his next shot.
\n" ); document.write( "So with a mighty swing he hit the ball into
\n" ); document.write( "the air and was surprised to see the ball hit
\n" ); document.write( "near the top of a 300 foot tall tower that he
\n" ); document.write( "had not noticed.\r
\n" ); document.write( "\n" ); document.write( "The formula for this shot is:
\n" ); document.write( "h(x)=-16x^2+120x where h is the height
\n" ); document.write( "of the ball and x is the number of seconds
\n" ); document.write( "the ball is in the air\r
\n" ); document.write( "\n" ); document.write( "How long did the ball actually hang in the air? \n" ); document.write( "

Algebra.Com's Answer #796124 by Boreal(15235) $\"\"$ $\"About$

You can put this solution on YOUR website!
-16x^2+120x=0 is where the ball started and ended (regarding time in seconds)
\n" ); document.write( "-16x(x-7.5)=0
\n" ); document.write( "x=0 and 7.5 seconds.
\n" ); document.write( "It was in the air for 7.5 seconds. \n" ); document.write( "

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