document.write( "Question 271688: An arithmetic series has 20 terms. The first is -50 and the last term is 83, find the sum of the series \n" ); document.write( "

Algebra.Com's Answer #198840 by checkley77(12844) $\"\"$ $\"About$

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SUM=N/2(A+L) WHERE N=NUMBER OF TERMS, A=THE FIRST TERM, L=THE LAST TERM.
\n" ); document.write( "S=20/2(-50+83)
\n" ); document.write( "S=10*33
\n" ); document.write( "S=330 ANS. \n" ); document.write( "

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