document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=165230>Question 165230</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help with this problem.<BR>\n" );
document.write( "I need to solve for a: S= n/2[2a+(n-1)d]<BR>\n" );
document.write( "Thank you for your help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #121785 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=121785\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> S= n/2[2a+(n-1)d]<BR>\n" );
document.write( "=n/2[2a+dn-d)<BR>\n" );
document.write( "=(2na+n^2d-nd)/2<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );