document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=652686>Question 652686</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A Little League baseball player throws a ball upward. The height h of the ball (in feet) t seconds after the ball is released is given by the quadratic equation<BR>\n" );
document.write( "h = -16t2 +30t +4\r<BR>\n" );
document.write( "\n" );
document.write( "a)	How long does it take the ball to reach a height of 18ft?<BR>\n" );
document.write( "b)	How long does it take the ball to hit the ground?<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #408059 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=408059\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "a.  Substitute the height value 18 for the variable representing height, <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE h\">, then put the equation into standard form and solve the factorable quadratic.  You will have two values, one is the time it will reach 18 feet on the way up and the other is the time it will be at 18 feet a second time on the way down.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "b.  Substitute the height value 0 for the variable representing height (the height of the ground is zero), <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE h\">, then solve the factorable quadratic.  Discard the negative root because you don't care what happened <b><i>before</i></b> he threw the ball.  (Do you?!)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Check Stanbon's (above) arithmetic <b><i>very</i></b> carefully.  Both of these quadratics are factorable over the Rationals.<BR>\n" );
document.write( " \r<BR>\n" );
document.write( "\n" );
document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi}\ +\ 1\ =\ 0\"><BR>\n" );
document.write( "My calculator said it, I believe it, that settles it<BR>\n" );
document.write( "<div  DISABLED_style= \"text-align:center\"><a  rel=nofollow HREF=\"http://outcampaign.org/\" target=\"_blank\"><IMG STYLE=\"max-width:80%;\" src=\"http://cdn.cloudfiles.mosso.com/c116811/scarlet_A.png\" border=\"0\" alt=\"The Out Campaign: Scarlet Letter of Atheism\" width=\"143\" height=\"122\" /></a></div><BR>\n" );
document.write( "</font> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );