document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=126987>Question 126987</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The monthly sales of socks,(S on thousands of pairs) , can be calcualted by S=-t(squared)+4t+40 where t is t=0 corresponds to the first month of sales (t in months) In which months were there:<BR>\n" );
document.write( "A)When were the maximum number of socks sold? For this one I used -b/2a to find the vertex and I came up with 2 months.\r<BR>\n" );
document.write( "\n" );
document.write( "B) What is the maximum number of socks sold? I'm thinking you would just double the first answer and get 4 months.\r<BR>\n" );
document.write( "\n" );
document.write( "C)When is the number of pairs sold equal to zero? Probably either 4 or 8 months. I think this because either I was wrong with 'B' and the maximum number was in month 2 or I was right and you just double 4.\r<BR>\n" );
document.write( "\n" );
document.write( "Thanks for any help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #93154 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=93154\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The monthly sales of socks,(S on thousands of pairs) , can be calcualted by S=-t(squared)+4t+40 where t is t=0 corresponds to the first month of sales (t in months) In which months were there:<BR>\n" );
document.write( ":<BR>\n" );
document.write( "A)When were the maximum number of socks sold? For this one I used -b/2a to find the vertex and I came up with 2 months. <BR>\n" );
document.write( ":<BR>\n" );
document.write( "This is correct, t = 2 is the axis of symmetry<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "B) What is the maximum number of socks sold?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "To find the maximum no. of socks, substitute 2 for t and find S<BR>\n" );
document.write( "S = -(2^2) + 4(2) + 40<BR>\n" );
document.write( "S = -4 + 8 + 40<BR>\n" );
document.write( "S = 44 thousand socks<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "C)When is the number of pairs sold equal to zero? <BR>\n" );
document.write( ":<BR>\n" );
document.write( "Solve for t when S = 0<BR>\n" );
document.write( "-t^2 + 4t + 40 = 0<BR>\n" );
document.write( "This requires the quadratic formula,<BR>\n" );
document.write( "Positive solution: t ~ 8.6 months<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Did this help?\r<BR>\n" );
document.write( "\n" );
document.write( "    </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );