SOLUTION: find the 30m th term as well as the sum of the 1st twenty terms of each of the following arithmetic sequences: i) -15; -8; -1

SOLUTION: find the 30m th term as well as the sum of the 1st twenty terms of each of the following arithmetic sequences: i) -15; -8; -1

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Question 1040095: find the 30m th term as well as the sum of the 1st twenty terms of each of the following arithmetic sequences:
i) -15; -8; -1

Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
index n;
, general term.

The term at n=30 is .

The sum of first 20 terms
according to the summation formula for arithmetic series
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