document.write( "Question 869239: Margaret shoots an arrow into the air. The equation for the height (in feet) of the tip of the arrow is h=8+64t−16t^2 To find the time at which the arrow is 56 feet above the ground, we replace h with 56 obtain\r
\n" ); document.write( "\n" ); document.write( "56=8+64t−16t^2\r
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\n" ); document.write( "\n" ); document.write( "Solve this equation for t to find the times at which the arrow is 56 feet above the ground.\r
\n" ); document.write( "\n" ); document.write( "The arrow is 56 feet above the ground after_______ seconds. \n" ); document.write( "
Algebra.Com's Answer #524121 by lwsshak3(11628)\"\" \"About 
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Margaret shoots an arrow into the air. The equation for the height (in feet) of the tip of the arrow is h=8+64t−16t^2 To find the time at which the arrow is 56 feet above the ground, we replace h with 56 obtain
\n" ); document.write( "56=8+64t−16t^2
\n" ); document.write( "-16t^2+64t-48=0
\n" ); document.write( "-t^2+4t-3=0
\n" ); document.write( "t^2-4t+3=0
\n" ); document.write( "(t-1)(t-3)=0
\n" ); document.write( "t=1
\n" ); document.write( "or
\n" ); document.write( "t=3
\n" ); document.write( "the arrow is 56 feet above the ground after 1 sec on the way up and after 3 sec on the way down\r
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