document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=706680>Question 706680</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the series summation notation of 5,10,15,20,25?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #435330 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=435330\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Try this:\r<BR>\n" );
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document.write( "(5+10+15+20+25)+(25+20+15+10+5)<BR>\n" );
document.write( "= <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2A%2830%29 ALIGN=MIDDLE  ALT=\"5%2A%2830%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2A%285%2B25%29 ALIGN=MIDDLE  ALT=\"5%2A%285%2B25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The sequence was repeated but backwards to create that sum.  We want HALF of that sum, so:<BR>\n" );
document.write( "WANT:  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%285%2A%285%2B25%29%2F2%29 ALIGN=MIDDLE  ALT=\"highlight%285%2A%285%2B25%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Note, this is for an arithmetic sequence of sequential terms being summed.<BR>\n" );
document.write( "That is the number of terms being summed, the use of the first and last term to be summed, and division by 2. </SPAN>\n" );
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