document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=835036>Question 835036</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find S[5] for the arithmetic sequence with <BR>\n" );
document.write( "a[3]=39 and a[5] =61 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #503324 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=503324\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Find S[5] for the arithmetic sequence with <BR>\n" );
document.write( "a[3]=39 and a[5] =61<BR>\n" );
document.write( "----<BR>\n" );
document.write( "a(3) = a + 2d = 39<BR>\n" );
document.write( "a(5) = a + 4d = 61<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Subtract to solve for \"d\":<BR>\n" );
document.write( "2d = 22<BR>\n" );
document.write( "d = 11<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Solve for \"a\":<BR>\n" );
document.write( "a + 2d = 39<BR>\n" );
document.write( "a = 39-2*11<BR>\n" );
document.write( "a = 17<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "To find S(5)<BR>\n" );
document.write( "S(n) = (n/2)(a+L)<BR>\n" );
document.write( "S(5) = (5/2)(17+61) = 5(39) = 195<BR>\n" );
document.write( "=========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );