document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=924604>Question 924604</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Barb pulled the plug in her bathtub and it started to drain. The amount of water in the bathtub as it drains is represented by the equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+L=-5t%5E2-8t%2B120+ ALIGN=MIDDLE  ALT=\"+L=-5t%5E2-8t%2B120+\"   DISABLED_style= \"max-width:90%; height:auto;\" > , where L represents the number of liters of water in the bathtub and t represents the amount of time, in minutes, since the plug was pulled. How many liters of water were in the bathtub when Barb pulled the plug? Round to the nearest tenth of a minute the amount of time it takes for all the water in the bathtub to drain.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #560990 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=560990\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hints:\r<BR>\n" );
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document.write( "For the first part, you are plugging in t = 0 and evaluating.\r<BR>\n" );
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document.write( "So you need to compute <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+L=-5%280%29%5E2-8%280%29%2B120+ ALIGN=MIDDLE  ALT=\"+L=-5%280%29%5E2-8%280%29%2B120+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "For the second part, you need to solve <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+0=-5t%5E2-8t%2B120+ ALIGN=MIDDLE  ALT=\"+0=-5t%5E2-8t%2B120+\"   DISABLED_style= \"max-width:90%; height:auto;\" > for t. You plug L = 0 into the equation because you want to know when the number of liters is 0. Make sure t is a positive number.\r<BR>\n" );
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document.write( "To solve <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+0=-5t%5E2-8t%2B120+ ALIGN=MIDDLE  ALT=\"+0=-5t%5E2-8t%2B120+\"   DISABLED_style= \"max-width:90%; height:auto;\" > for t, you need to use the quadratic formula.\r<BR>\n" );
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document.write( "Let me know if these hints help or not. If not, then let me know. Thanks. </SPAN>\n" );
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