document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=728349>Question 728349</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rocket shot into the aire has a height of s= 128t - 16t^2 feet, where t is the number of seconds after the rocket is shot.  During what time after the rocket is shot is it atleast 240 feet high?? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #445378 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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/cgi-bin/show-face.mpl?user=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=445378\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">     A rocket shot into the aire has a height of s= 128t - 16t^2 feet, where t is the number of seconds after the rocket is shot. During what time after the rocket is shot is it atleast 240 feet high??<BR>\n" );
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document.write( "set s to 240 and solve for t:<BR>\n" );
document.write( "s= 128t - 16t^2<BR>\n" );
document.write( "240 = 128t - 16t^2<BR>\n" );
document.write( "15 = 8t - t^2<BR>\n" );
document.write( "t^2 + 15 = 8t<BR>\n" );
document.write( "t^2 - 8t + 15 = 0<BR>\n" );
document.write( "(t-3)(t-5) = 0<BR>\n" );
document.write( "t = {3, 5}<BR>\n" );
document.write( "answer: the entire time between 3 seconds and 5 seconds<BR>\n" );
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