SOLUTION: what is the sum of the series S28 for -143+(-134)+(-125)+(-116)+..

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Question 619018: what is the sum of the series S28 for -143+(-134)+(-125)+(-116)+..
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

sum of the series S28 for -143+(-134)+(-125)+(-116)+..

Arithmetic Series, d = 9

S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29

S%5B28%5D=%2828%2F2%29%282%2A%28-143%29%2B+%2827%299%29