document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=326672>Question 326672</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a ball is thrown downward from a window in a tall building. It's position is t in seconds is s =16t^2+32t, where s is in feet. how long will it take the ball to fall 81 feet? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #233925 by </B><A HREF=/tutors/aboutme.mpl?userid=jvan><B>jvan(28)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jvan><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=233925\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Plug in the number of feet given to find the time: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=16t%5E2%2B32t ALIGN=MIDDLE  ALT=\"s+=16t%5E2%2B32t\"   DISABLED_style= \"max-width:90%; height:auto;\" > becomes <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=81feet+=16t%5E2%2B32t ALIGN=MIDDLE  ALT=\"81feet+=16t%5E2%2B32t\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Move the 81 to the right by subtracting 81 from both sides<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=16t%5E2%2B32t-81 ALIGN=MIDDLE  ALT=\"0=16t%5E2%2B32t-81\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Use the quadratic equation with a=16, b=32, and c=-81: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29 ALIGN=MIDDLE  ALT=\"t=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >. You find that t=1.4622seconds or t=-3.4622seconds. You know that the time can't be negative, so the answer is t=1.46seconds. To check you can plug 1.4622seconds in for t and make sure you get s=81feet =)<BR>\n" );
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