document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=872589>Question 872589</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If an object is thrown upward with an initial velocity of 15ft per second, its hight is given by h=-15t^2+90t after t seconds. What it its maximum height?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #526244 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16949)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=526244\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h=-15t^2+90t\r<BR>\n" );
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document.write( "the vertex of a parabola is at \r<BR>\n" );
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document.write( "x= -b/2a\r<BR>\n" );
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document.write( "b=90\r<BR>\n" );
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document.write( "a=-15\r<BR>\n" );
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document.write( "x= -90/-30<BR>\n" );
document.write( "x= 3 \r<BR>\n" );
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document.write( "plug x = 3 to get the y co ordinate or h\r<BR>\n" );
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document.write( "h= -15*(3)^2+90*(3)\r<BR>\n" );
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document.write( "h=135 feet the maximum height\r<BR>\n" );
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