document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=424391>Question 424391</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Can you help with this?<BR>\n" );
document.write( "a ball is thrown, its height in feet h after t seconds is given: <BR>\n" );
document.write( "h=vt-16t^2<BR>\n" );
document.write( "v=initial upward velocity in feet per second.  if v=21 feet per second, find all values of t which h=6 feet. Do not round intermediate steps, round answer 2 decimals.  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 #295973 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=295973\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a ball is thrown, its height in feet h after t seconds is given:<BR>\n" );
document.write( "h = vt - 16t^2<BR>\n" );
document.write( "v=initial upward velocity in feet per second.<BR>\n" );
document.write( ":<BR>\n" );
document.write( " if v=21 feet per second, find all values of t which h=6 feet.<BR>\n" );
document.write( " Do not round intermediate steps, round answer 2 decimals.<BR>\n" );
document.write( ":<BR>\n" );
document.write( " 21t - 16t^2 = 6<BR>\n" );
document.write( "A quadratic equation<BR>\n" );
document.write( "-16t^2 + 21t - 6 = 0<BR>\n" );
document.write( "Use the quadratic formula to find t<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "In this equation; x=t; a=-16; b=21 c=-6<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+%28-21+%2B-+sqrt%2821%5E2-4%2A-16%2A-6+%29%29%2F%282%2A-16%29+ ALIGN=MIDDLE  ALT=\"t+=+%28-21+%2B-+sqrt%2821%5E2-4%2A-16%2A-6+%29%29%2F%282%2A-16%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+%28-21+%2B-+sqrt%28441-384+%29%29%2F%28-32%29+ ALIGN=MIDDLE  ALT=\"t+=+%28-21+%2B-+sqrt%28441-384+%29%29%2F%28-32%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+%28-21+%2B-+sqrt%2857+%29%29%2F%28-32%29+ ALIGN=MIDDLE  ALT=\"t+=+%28-21+%2B-+sqrt%2857+%29%29%2F%28-32%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Two solutions<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+%28-21+%2B+7.5498%29%2F%28-32%29+ ALIGN=MIDDLE  ALT=\"t+=+%28-21+%2B+7.5498%29%2F%28-32%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-13.450%29%2F%28-32%29 ALIGN=MIDDLE  ALT=\"%28-13.450%29%2F%28-32%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = .42 sec, 6 ft on the way up<BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+%28-21+-+7.5498%29%2F%28-32%29+ ALIGN=MIDDLE  ALT=\"t+=+%28-21+-+7.5498%29%2F%28-32%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-28.5498%29%2F%28-32%29 ALIGN=MIDDLE  ALT=\"%28-28.5498%29%2F%28-32%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = .89 sec, 6ft on the way down<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Looks like this:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+200%2C+-1%2C+3%2C+-4%2C+10%2C+-16x%5E2%2B21x%2C+6%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+200%2C+-1%2C+3%2C+-4%2C+10%2C+-16x%5E2%2B21x%2C+6%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );