document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=309332>Question 309332</A>: <I><SPAN STYLE=\"word-break: break-all;\"> find the sum of the arithmetic series.-4,+1+6+11+........+91 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #221236 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=221236\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  find the sum of the arithmetic series.-4,+1+6+11+........+91<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "a(1) = -4<BR>\n" );
document.write( "d = 5<BR>\n" );
document.write( "---<BR>\n" );
document.write( "91 = -4 + (n-1)5<BR>\n" );
document.write( "95 = (n-1)5<BR>\n" );
document.write( "n-1 = 19<BR>\n" );
document.write( "n = 20<BR>\n" );
document.write( "---<BR>\n" );
document.write( "S(20) = (20/2)(-4+91)<BR>\n" );
document.write( "S(20) = 10(95)<BR>\n" );
document.write( "S(20) = 950<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );