document.write( "Question 1205920: A ball is thrown upward from the top of a building 80 feet tall with an initial velocity of 64 feet per second. Solve the equation: -16t^2+64t+80=144 to find the time t​ (in seconds) at which the ball is 144 feet from the ground. \n" ); document.write( "
Algebra.Com's Answer #843015 by ankor@dixie-net.com(22740)\"\" \"About 
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A ball is thrown upward from the top of a building 80 feet tall with an initial velocity of 64 feet per second.
\n" ); document.write( " Solve the equation: -16t^2+64t+80=144 to find the time t​ (in seconds) at which the ball is 144 feet from the ground.
\n" ); document.write( ":
\n" ); document.write( " -16t^2 + 64t + 80 = 144
\n" ); document.write( "Simplify, divide equation by -16
\n" ); document.write( "t^2 - 4t - 5 = -9
\n" ); document.write( "t^2 - 4t - 5 + 9 = 0
\n" ); document.write( "t^2 - 4t + 4 = 0
\n" ); document.write( "Factors to
\n" ); document.write( "(t-2)(t-2) = 0
\n" ); document.write( "t = 2 Seconds \n" ); document.write( "
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