document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=831792>Question 831792</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown into the air from a bridge that is 15 m above a river. The function that models the height, h(t), in metres , of the ball over time,t, in seconds is : h(t)=-4.9t^2+9t+15 <BR>\n" );
document.write( "When is the ball 17m above the water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #501636 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=501636\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 17=-4.9t^2+9t+15 <BR>\n" );
document.write( "t = 0.258644 <BR>\n" );
document.write( "and<BR>\n" );
document.write( "t = 1.57809 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );