document.write( "Question 864333: A firecracker is fired straight up into the air out of a window of a building. Its height, in feet, is given by h = -16 t^2 + 112 t + 304, where t is the time, in seconds, the fircracker has been in the air. \r
\n" ); document.write( "\n" ); document.write( "By setting up and solving an equation, find the time(s) when it reaches a height of 400 feet \n" ); document.write( "
Algebra.Com's Answer #520996 by lwsshak3(11628)\"\" \"About 
You can put this solution on YOUR website!
A firecracker is fired straight up into the air out of a window of a building. Its height, in feet, is given by h = -16 t^2 + 112 t + 304, where t is the time, in seconds, the fircracker has been in the air.
\n" ); document.write( "By setting up and solving an equation, find the time(s) when it reaches a height of 400 feet
\n" ); document.write( "***
\n" ); document.write( "h = -16 t^2 + 112 t + 304
\n" ); document.write( "400=-16 t^2 + 112 t + 304
\n" ); document.write( "-16 t^2 + 112 t -96=0
\n" ); document.write( "16 t^2 - 112 t +96=0
\n" ); document.write( "t^2-7t +6=0
\n" ); document.write( "(t-6)(t-1)=0
\n" ); document.write( "t=6
\n" ); document.write( "and
\n" ); document.write( "t=1
\n" ); document.write( "After 1 sec firecracker reaches height of 400 ft on the way up.
\n" ); document.write( "After 6 sec fire cracker falls to a height of 400 ft on the way down.\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );