document.write( "Question 873129: Help! I need an answer quickly for this:\r
\n" ); document.write( "\n" ); document.write( "Susie throws a ball from a starting height of 10 feet upwards at an initial velocity of 30 ft/sec. How long will it take for the ball to hit a target 15 ft high?
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Algebra.Com's Answer #526647 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
The equation would be:
\n" ); document.write( "\"+h%28t%29+=+-16t%5E2+%2B+30t+%2B+10+\"
\n" ); document.write( "\"+h+\" is height in feet, and \"+t+\" is time in seconds
\n" ); document.write( "----------------------------
\n" ); document.write( "You need to know when \"+h%28t%29+=++15+\" ft
\n" ); document.write( "\"+15+=+-16t%5E2+%2B+30t+%2B+10+\"
\n" ); document.write( "\"+-16t%5E2+%2B+30t+-+5+=+0+\"
\n" ); document.write( "Use the quadratic formula
\n" ); document.write( "\"+t+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "\"+a+=+-16+\"
\n" ); document.write( "\"+b+=+30+\"
\n" ); document.write( "\"+c+=+-5+\"
\n" ); document.write( "\"+t+=+%28-30+%2B-+sqrt%28+30%5E2-4%2A%28-16%29%2A%28-5%29+%29%29%2F%282%2A%28-16%29%29+\"
\n" ); document.write( "\"+t+=+%28-30+%2B-+sqrt%28+900+-+320+%29%29%2F%28-32%29+\"
\n" ); document.write( "\"+t+=+%28+-30+%2B-sqrt%28+580+%29+%29+%2F+%28-32%29+\"
\n" ); document.write( "\"+t+=+%28+-30+%2B+24.0832+%29+%2F+%28+-32+%29+\"
\n" ); document.write( "\"+t+=+5.9168+%2F+32+\"
\n" ); document.write( "\"+t+=+.185+\"
\n" ); document.write( "It will take the ball .185 sec to hit the target
\n" ); document.write( "check answer:
\n" ); document.write( "\"+15+=+-16t%5E2+%2B+30t+%2B+10+\"
\n" ); document.write( "\"+5+=+-16%2A.185%5E2+%2B+30%2A.185+\"
\n" ); document.write( "\"+5+=+-16%2A.034225+%2B+5.55+\"
\n" ); document.write( "\"+5+=+-.5476+%2B+5.55+\"
\n" ); document.write( "\"+5+=+5.0024+\"
\n" ); document.write( "close enough
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