document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=29459>Question 29459</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Just need some help setting this one up please, I believe it should be a quadratic equation but not quite sure. ok here it is: A ball is thrown vertically upward from the ground. Its distance in feet from the ground in t seconds is -16t^2+112t. After how many seconds will the ball be 160 feet from the ground? I was thinking it should be set up as -16t^2+112t-160=0 Thanks for your help!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #16253 by </B><A HREF=/tutors/aboutme.mpl?userid=longjonsilver><B>longjonsilver(2297)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=longjonsilver><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=longjonsilver><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=16253\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> distance = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-16t%5E2%2B112t ALIGN=MIDDLE  ALT=\"-16t%5E2%2B112t\"   DISABLED_style= \"max-width:90%; height:auto;\" >, so we have<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=160+=+-16t%5E2%2B112t ALIGN=MIDDLE  ALT=\"160+=+-16t%5E2%2B112t\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "so <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0+=+-16t%5E2%2B112t-160 ALIGN=MIDDLE  ALT=\"0+=+-16t%5E2%2B112t-160\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+16t%5E2-112t%2B160+=+0+ ALIGN=MIDDLE  ALT=\"+16t%5E2-112t%2B160+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5E2-7t%2B10+=+0+ ALIGN=MIDDLE  ALT=\"+t%5E2-7t%2B10+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "then factorise... 5 and 2 etc.\r<BR>\n" );
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document.write( "you will get 2 answers. What does getting 2 times mean physically?\r<BR>\n" );
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document.write( "jon.<BR>\n" );
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