Mathematics, 14.11.2020 14:00 fatherbamboo

17 An arithmetic sequence has first term a and common difference d. The sum of the first 20 terms is seven time the sum of the first five terms.
a Find d in terms of a. a:80
b Find the 65th term in terms of a.

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17 An arithmetic sequence has first term a and common difference d. The sum of the first 20 terms is...

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17 An arithmetic sequence has first term a and common difference d. The sum of the first 20 terms is seven time the sum of the first five terms.a Find d in terms of a. a:80b Find the 65th term in terms of a.

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Another question on Mathematics

17 An arithmetic sequence has first term a and common difference d. The sum of the first 20 terms is seven time the sum of the first five terms.
a Find d in terms of a. a:80
b Find the 65th term in terms of a.