document.write( "Question 993688: If an object is projected vertically upward from ground level with an initial velocity of 240 ft/sec, then its distance s above the ground after t seconds is given by s = −12t^2 + 240t.For what values of t will the object be more than 1188 feet above the ground? \n" ); document.write( "
Algebra.Com's Answer #612904 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
You need to find:
\n" ); document.write( "\"+s+%3E+1188+\"
\n" ); document.write( "\"+-12t%5E2+%2B+240t+%3E+1188+\"
\n" ); document.write( "\"+-t%5E2+%2B+120t+%3E+594+\"
\n" ); document.write( "First find:
\n" ); document.write( "\"+-t%5E2+%2B+120t+=+594+\"
\n" ); document.write( "Complete the square:
\n" ); document.write( "\"+t%5E2+-+120t+%2B+%28+-120%2F2+%29%5E2+=+-594+%2B+%28+-120%2F2+%29%5E2+\"
\n" ); document.write( "\"+t%5E2+-+120t+%2B+3600+=+-594+%2B+3600+\"
\n" ); document.write( "\"+%28+t+-+60+%29%5E2+=+3006+\"
\n" ); document.write( "\"+%28+t+-+60+%29%5E2+=+54.827%5E2+\"
\n" ); document.write( "\"+t+-+60+=+54.827+\"
\n" ); document.write( "\"+t+=+114.827+\"
\n" ); document.write( "and also:
\n" ); document.write( "\"+t+-+60+=+-54.827+\"
\n" ); document.write( "\"+t+=+5.173+\"
\n" ); document.write( "----------------------
\n" ); document.write( "The values of \"+t+\" for which \"+-12t%5E2+%2B+240t+%3E+1188+\" are:
\n" ); document.write( "\"+5.173+%3C+t+%3C+114.827+\"
\n" ); document.write( "------------------------
\n" ); document.write( "Check:
\n" ); document.write( "Let \"+t+=+5.1+\"
\n" ); document.write( "\"+-12t%5E2+%2B+240t+%3E+1188+\"
\n" ); document.write( "\"+-12%2A5.1%5E2+%2B+240%2A5.1+%3E+1188+\"
\n" ); document.write( "\"+-12%2A26.01+%2B+1224+%3E1188+\"
\n" ); document.write( "\"+-312.12+%2B+1224+%3E+1188+\"
\n" ); document.write( "\"+911.88+%3E+1188+\"
\n" ); document.write( "This is not true, as it must be
\n" ); document.write( "Now check for:
\n" ); document.write( "\"+t+=+114.85+\", and the inequality
\n" ); document.write( "must also be NOT true
\n" ); document.write( "
\n" );