document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=38731>Question 38731</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When a ball is thrown, its height in feet \"h\" after \"t\" seconds is given by the equation<BR>\n" );
document.write( "h = vt - 16t^2.<BR>\n" );
document.write( "In this equation, \"v\" is the initial upwards velocity in feet per second. If v=28 feet per second, find all values of \"t\" for which h=12 feet. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #24690 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=24690\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let us substitute the values as given and then solve for t...<BR>\n" );
document.write( "h = vt - 16t^2<BR>\n" );
document.write( "12 = 28t - 16t^2<BR>\n" );
document.write( "16t^2 - 28t + 12 = 0<BR>\n" );
document.write( "4t^2 - 7t + 3 = 0<BR>\n" );
document.write( "(4t - 1)(t - 3) = 0<BR>\n" );
document.write( "Thus<BR>\n" );
document.write( "t = 1/4 sec and t = 3 sec </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );