document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=814078>Question 814078</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A stone is projected vertically upward from a platform that is 15 feet high at a rate of 106 ft per second. When will it reach its maximum height? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #490096 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=490096\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h(t)=-16t^2+106t+15<BR>\n" );
document.write( "parabola<BR>\n" );
document.write( "focus | (53/16, 12195/64)~~(3.3125, 190.547)<BR>\n" );
document.write( "vertex | (53/16, 3049/16)~~(3.3125, 190.563)<BR>\n" );
document.write( "semi-axis length | 1/64 = 0.015625<BR>\n" );
document.write( "focal parameter | 1/32 = 0.03125<BR>\n" );
document.write( "eccentricity | 1<BR>\n" );
document.write( "directrix | h = 12197/64\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "vertex | (53/16, 3049/16)~~(3.3125, 190.563)<BR>\n" );
document.write( "at t= 53/16 (3.3125)  it reaches 3049/16 (190.563) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );