SOLUTION: An arithmetic series has 20 terms. The first is -50 and the last term is 83, find the sum of the series

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Question 271688: An arithmetic series has 20 terms. The first is -50 and the last term is 83, find the sum of the series
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
SUM=N/2(A+L) WHERE N=NUMBER OF TERMS, A=THE FIRST TERM, L=THE LAST TERM.
S=20/2(-50+83)
S=10*33
S=330 ANS.