document.write( "Question 38763This question is from textbook
\n" ); document.write( ": find the sum of he first 20 terms of the airthmetic series -2+1+4+7 \n" ); document.write( "
Algebra.Com's Answer #24266 by Nate(3500)\"\" \"About 
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\"s+=+%28n%2F2%29%28a+%2B+55%29%29\"
\n" ); document.write( "\"s+=+%2810%29%28-2+%2B+55%29%29\"
\n" ); document.write( "\"s+=+530\"
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