document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1077665>Question 1077665</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A volleyball is thrown straight up.  The equation that describes its motion is h(t) = -16t^2 + 48t + 4, where h represents the height in feet and t represents time in seconds.  How long will it take for the ball to hit the ground?  Round to the nearest hundredth, if necessary.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #692120 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=692120\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h(t) = -16t^2 + 48t + 4<BR>\n" );
document.write( "Let h(t)=0, and solve for the positive root<BR>\n" );
document.write( "Divide by 4<BR>\n" );
document.write( "-4t^2+12t+1=0 or 4t^2-12t-1=0<BR>\n" );
document.write( "t=(1/8)(12+/- sqrt (144+16); sqrt 160=12.65<BR>\n" );
document.write( "t=24.65/8=3.08 sec<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C300%2C-5%2C5%2C-10%2C50%2C-16x%5E2%2B48x%2B4%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C300%2C-5%2C5%2C-10%2C50%2C-16x%5E2%2B48x%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );