15. The 8tn term of an arithmetic sequence is 16, and the 18th term is 56. 20 terms. Find the sum of the first 15. 520

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15. The 8tn term of an arithmetic sequence is 16, and the 18th term is 56.
20 terms.
Find the sum of the first
Transcribed Image Text:15. The 8tn term of an arithmetic sequence is 16, and the 18th term is 56. 20 terms. Find the sum of the first
15. 520
Transcribed Image Text:15. 520
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