document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=897384>Question 897384</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have attempted to solve this but have failed. Could someone Please, Please, please help me? I am new to Algebra so could you explain step by step as to how you arrived at the answer?\r<BR>\n" );
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document.write( "A ball is thrown straight up from a rooftop at 720 feet high. The formula h=-16t^2+44t+720 describes the balls height above the ground, h, in feet, t seconds after it was thrown. The ball misses the rooftop on its way down. Determine when the balls height will be 540 feet . </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #544110 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=544110\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown straight up from a rooftop at 720 feet high. The formula h=-16t^2+44t+720 describes the balls height above the ground, h, in feet, t seconds after it was thrown. The ball misses the rooftop on its way down. Determine when the balls height will be 540 feet <BR>\n" );
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document.write( "Let the height (h) be 540.  Then solve the equation for time (t).<BR>\n" );
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document.write( "-16t^2 + 44t + 720 = 540<BR>\n" );
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document.write( "-16t^2 + 44t + 180 = 0<BR>\n" );
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document.write( "16t^2 - 44t - 180 = 0<BR>\n" );
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document.write( "Use the quadratic formula to solve for time (t).<BR>\n" );
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document.write( "t = [44 +- sqrt(44^2 - 4*16*-180)]/32<BR>\n" );
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document.write( "t = [44 +- 116]/32<BR>\n" );
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document.write( "Positive solution:<BR>\n" );
document.write( "t = 5 seconds<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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