SOLUTION: find the sum of the first 50 terms of the arithmetic sequence below -13, -5, 3, 11...

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Question 930474: find the sum of the first 50 terms of the arithmetic sequence below
-13, -5, 3, 11...
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
-13, -5, 3, 11...
arithmetic sequence: d = 8
..........
a50 = -13 + (49)6 = 281
S(50) = 50/2(-13 + 281) = 25*268 = 6,700