document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1205519>Question 1205519</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The equation H(T)=-16x^2+64x+9 models the height, H , in feet, of a model rocket t<BR>\n" );
document.write( "seconds after it has been launched from 9 feet above the ground. How many seconds after launching the rocket will it reach its maximum height?<BR>\n" );
document.write( "A.1 seconds<BR>\n" );
document.write( "B.2 seconds<BR>\n" );
document.write( "C.2.5 seconds<BR>\n" );
document.write( "D.3 seconds  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #842376 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20849)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=842376\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=H%28t%29=-16x%5E2%2B64x%2B9 ALIGN=MIDDLE  ALT=\"H%28t%29=-16x%5E2%2B64x%2B9\"   DISABLED_style= \"max-width:90%; height:auto;\" >   this is a parabola that opens down\r<BR>\n" );
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document.write( " so we can find <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" > coordinate of the maximum using the formula\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-b%2F2a ALIGN=MIDDLE  ALT=\"t=-b%2F2a\"   DISABLED_style= \"max-width:90%; height:auto;\" > where <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=64 ALIGN=MIDDLE  ALT=\"b=64\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=-16 ALIGN=MIDDLE  ALT=\"a=-16\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-64%2F%282%28-16%29%29 ALIGN=MIDDLE  ALT=\"t=-64%2F%282%28-16%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-64%2F%28-32%29 ALIGN=MIDDLE  ALT=\"t=-64%2F%28-32%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=2 ALIGN=MIDDLE  ALT=\"t=2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "answer:\r<BR>\n" );
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document.write( "B.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2+ ALIGN=MIDDLE  ALT=\"2+\"   DISABLED_style= \"max-width:90%; height:auto;\" >seconds\r<BR>\n" );
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document.write( " </SPAN>\n" );
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