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.

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above

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answer

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