document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=370519>Question 370519</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the answer to find the sum of the first 70 terms of the arithmetic sequence 45, 39, 33, 27? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #264107 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=264107\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the answer to find the sum of the first 70 terms of the arithmetic sequence 45, 39, 33, 27<BR>\n" );
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document.write( "1st term: a = 45<BR>\n" );
document.write( "Common difference: d = -6<BR>\n" );
document.write( "n = 70<BR>\n" );
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document.write( "last = a(70) = 45+(69)(-6) = -369<BR>\n" );
document.write( "S(n) = (n/2)(a + last)<BR>\n" );
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document.write( "S(70) = (70/2)(45-369)<BR>\n" );
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document.write( "S(70) = 35(-324) = -11340<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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