document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=44981>Question 44981</A>: <I><SPAN STYLE=\"word-break: break-all;\"> this is a different one our instructor wrote for us.  I have not a clue how to begin.\r<BR>\n" );
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document.write( "at these prices it is estimated that the number of customers is related to the amount of time they must wait as,<BR>\n" );
document.write( "N = -5t(squared)+80t-280, where t is time in minutes.  When there are 35 customers what is the estimated wait time?    </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #29883 by </B><A HREF=/tutors/aboutme.mpl?userid=tutorcecilia><B>tutorcecilia(2152)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tutorcecilia><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=tutorcecilia><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=29883\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> N = -5t(squared)+80t-280, where t is time in minutes. When there are 35 customers what is the estimated wait time? <BR>\n" );
document.write( "N =35<BR>\n" );
document.write( "35= -5t(squared)+80t-280 <BR>\n" );
document.write( "35 - 35 = -5t(squared)+80t-280-35 [Set the equation equal to zero]<BR>\n" );
document.write( "0=-5t(squared)+80t-315 [solve using the quadratic formula]<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-80+%2B-+sqrt%28+6400-6300+%29%29%2F%28-10%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-80+%2B-+sqrt%28+6400-6300+%29%29%2F%28-10%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=x+=+%28-80+%2B-+sqrt%28+100+%29%29%2F%28-10%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-80+%2B-+sqrt%28+100+%29%29%2F%28-10%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".-80+-10/-10<BR>\n" );
document.write( ".-80+10/-10t = 7 minutes<BR>\n" );
document.write( ".-80-10/-10 =9 minutes<BR>\n" );
document.write( "Taking the average 9+7/2 = 8 minutes<BR>\n" );
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