document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=350996>Question 350996</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 1981, Vladamir Poliakov (USSR) set a world record of 19ft 3/4 in for the pole vault.  To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the runway.  The formula h=-16t2 + 36t gives his height t seconds after leaving the ground. <BR>\n" );
document.write( "a. use the formula to find the exact values for t for which his height was 18 feet. <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #250924 by </B><A HREF=/tutors/aboutme.mpl?userid=nyc_function><B>nyc_function(2741)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nyc_function><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=nyc_function><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=250924\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let h = 18 and solve for t.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "h = -16t^2 + 36t\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "18 = -16t^2 + 36t\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Bring everything to the left and set quadratic equation to zero.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "16t^2 - 36t + 18 = 0\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Use the quadratic formula to find your values for t.  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );