document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=903519>Question 903519</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi, would you help me solve this problem, please?<BR>\n" );
document.write( "A person standing close to the edge on the top of a 311-foot building throws a baseball vertically upward.  The quadratic equation:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h=-16t%5E2+%2B+128t+%2B+311 ALIGN=MIDDLE  ALT=\"+h=-16t%5E2+%2B+128t+%2B+311\"   DISABLED_style= \"max-width:90%; height:auto;\" > models the ball's height \"h\" above the ground in feet, \"t\" seconds after it was thrown.<BR>\n" );
document.write( "1a)How high is the ball after 4 seconds?<BR>\n" );
document.write( "I got 567 feet but this might be incorrect. <BR>\n" );
document.write( "1b) How many seconds does it take until the ball finally hits the ground? Round to nearest tenth of a second.\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you!<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 #548110 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=548110\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a) h=-16t^2 + 128t + 311<BR>\n" );
document.write( "plug in 4 for t<BR>\n" );
document.write( "567 is correct<BR>\n" );
document.write( "b)<BR>\n" );
document.write( "h=-16t^2 + 128t + 311<BR>\n" );
document.write( "plug in 0 for h<BR>\n" );
document.write( "t=9.95294 seconds </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );