document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=198427>Question 198427</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Tiger Woods hits a golf ball into the air. The equation that describs the path of the ball is h=55t-5t^2. There are three questions. (A How high is it the ball after 2 seconds?) (B When will it first reach 140 meters?) (C When will it hit the ground?) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #148926 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=148926\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Tiger Woods hits a golf ball into the air. The equation that describs the path of the ball is h=55t-5t^2. There are three questions. <BR>\n" );
document.write( "(A How high is it the ball after 2 seconds?) <BR>\n" );
document.write( "h=55t-5t^2<BR>\n" );
document.write( "Simply substitute 't' with 2 and solve:<BR>\n" );
document.write( "h=55(2)-5(2)^2<BR>\n" );
document.write( "h=110-5(4)<BR>\n" );
document.write( "h=110-20<BR>\n" );
document.write( "h=90 meters<BR>\n" );
document.write( ".<BR>\n" );
document.write( "(B When will it first reach 140 meters?) <BR>\n" );
document.write( "h=55t-5t^2<BR>\n" );
document.write( "Subsitute 'h' with 140 meters and solve:<BR>\n" );
document.write( "140=55t-5t^2<BR>\n" );
document.write( "0=55t-5t^2-140<BR>\n" );
document.write( "0=-5t^2+55t-140<BR>\n" );
document.write( "0=-t^2+11t-28<BR>\n" );
document.write( "0=t^2-11t+28<BR>\n" );
document.write( "0=(t-4)(t-7)<BR>\n" );
document.write( "t = {4,7}<BR>\n" );
document.write( "Ball reaches height  at 4 and 7 seconds\r<BR>\n" );
document.write( "\n" );
document.write( ".<BR>\n" );
document.write( "(C When will it hit the ground?)<BR>\n" );
document.write( "h=55t-5t^2<BR>\n" );
document.write( "Subsitute 'h' with 0 meters and solve:<BR>\n" );
document.write( "0=55t-5t^2<BR>\n" );
document.write( "0=11t-t^2<BR>\n" );
document.write( "0=-t^2+11t<BR>\n" );
document.write( "0=t^2-11t<BR>\n" );
document.write( "0=t(t-11)<BR>\n" );
document.write( "t = {0,11}<BR>\n" );
document.write( "Ball is at 0 meters at 0 seconds and 11 seconds\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );