document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=61942>Question 61942</A>: <I><SPAN STYLE=\"word-break: break-all;\"> i really need help with this but no one has responded...is there anyone who can help? PLEASE!\r<BR>\n" );
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document.write( "fireworks are launched into the air.  the quadratic function that models the fireworks height, s(x), in feet, x seconds after they are launched is given by the equation s(x)=-16x^2+200x+4.  when should the fireworks explode so that they go off at the greatest height? What is that height? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #42653 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=42653\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> s(x)=-16x^2+200x+4. when should the fireworks explode so that they go off at the greatest height? What is that height?<BR>\n" );
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document.write( "You have a quadratic with a=-16 and b=200<BR>\n" );
document.write( "The maximum point occurs at x=-b/2a=-200/(-32)=6.25 seconds<BR>\n" );
document.write( "The height at that time is <BR>\n" );
document.write( "s(6.25)=629 ft.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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