document.write( "Question 161515This question is from textbook finite mathematics
\n" ); document.write( ": Can someone please help me with this problem:\r
\n" ); document.write( "\n" ); document.write( "A ball is thrown downward from a window in a tall building. Its position at time t in seconds is s = 16t^2 + 32t, where s is in feet. How long (to the nearest tenth) will it take the ball to fall 175 feet? \n" ); document.write( "
Algebra.Com's Answer #118975 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
s = 16t^2 + 32t
\n" ); document.write( "175=16t^2+32t
\n" ); document.write( "16t^2+32t-175=0
\n" ); document.write( "Using the quadratic equation:\"t+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"We get:
\n" ); document.write( "t=(-32+-sqrt32^2-4*16*-175])/2*16
\n" ); document.write( "t=(-32+-sqrt[1,024+11,200])/32
\n" ); document.write( "t=(-32+-sqrt12,224)/32
\n" ); document.write( "t=(-32+-110.562)/32
\n" ); document.write( "t=(-32+110.562)/32
\n" ); document.write( "t=78.562/32
\n" ); document.write( "t=2.455 seconds
\n" ); document.write( "Proof:
\n" ); document.write( "175=16*2.455^2+32*2.455
\n" ); document.write( "175=16*6.027+78.56
\n" ); document.write( "175=96.432+78.56
\n" ); document.write( "175~174.992
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