Answer:
15. d.-23
16. a.9
17. a.644
18. b. 19,36,53
19. a.
20. d.69
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Answers & Comments
Answer:
15. d.-23
16. a.9
17. a.644
18. b. 19,36,53
19. a.![a_{n} =n^{2} + 2n a_{n} =n^{2} + 2n](https://tex.z-dn.net/?f=a_%7Bn%7D%20%3Dn%5E%7B2%7D%20%2B%202n)
20. d.69