document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=932721>Question 932721</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the sum of the integers from -10 to 50? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #566350 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=566350\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> what is the sum of the integers from -10 to 50?<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "-10 to 50 inclusive --> 61 integers<BR>\n" );
document.write( "The center integer is (-10 + 50)/2 = 20<BR>\n" );
document.write( "View it as 30 pairs + 20<BR>\n" );
document.write( "----<BR>\n" );
document.write( "For each pair,<BR>\n" );
document.write( "-10 + 50 = 40<BR>\n" );
document.write( "-9 + 49 = 40<BR>\n" );
document.write( "etc<BR>\n" );
document.write( "--> 30*40 + 20<BR>\n" );
document.write( "= 1220<BR>\n" );
document.write( " </SPAN>\n" );
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