document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=932844>Question 932844</A>: <I><SPAN STYLE=\"word-break: break-all;\"> i have a word problem and am trying to estimate maximum height and have the equation 0=-4.9t^2+16t+20 and need to solve for t but i cant find a way that works please help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #566457 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=566457\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -4.9t^2+16t+20 is a parabola that opens downward, so we want the vertex of the parabola<BR>\n" );
document.write( "t coordinate for the vertex is -b/2a = -16/(2*-4.9) = 1.632653061<BR>\n" );
document.write( "now substitute for t in the equation<BR>\n" );
document.write( "max height = -4.9*(1.632653061)^2 +16*1.632653061 + 20 = 33.06122449<BR>\n" );
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