Arithmetic sequences and series

1. 1.
   Find the sum of the first 15 terms of -5, -1, 3, 7, …
2. 2.
   What is the 17th term of 2, 1, 0, -1, …
3. 3.
   What is the 17th term of 3, 11, 19, 27, …
4. 4.
   What is the 8th term of -4, 2, 8, 14, …
5. 5.
   Find the sum of the first 19 terms of -5, -7, -9, -11, …
6. 6.
   What is the 9th term of -2, 1, 4, 7, …
7. 7.
   What is the 16th term of 9, 14, 19, 24, …
8. 8.
   What is the 11th term of 1, 4, 7, 10, …
9. 9.
   What is the 9th term of 8, 5, 2, -1, …
10. 10.
    What is the 16th term of 3, 0, -3, -6, …
11. 11.
    Find the sum of the first 19 terms of 12, 21, 30, 39, …
12. 12.
    What is the 19th term of 7, 3, -1, -5, …
13. 13.
    What is the 12th term of -3, 3, 9, 15, …
14. 14.
    Find the sum of the first 14 terms of 10, 7, 4, 1, …
15. 15.
    What is the 19th term of 9, 16, 23, 30, …
16. 16.
    What is the 12th term of -2, 1, 4, 7, …
17. 17.
    Find the sum of the first 8 terms of -4, -7, -10, -13, …
18. 18.
    What is the 14th term of -1, 1, 3, 5, …
19. 19.
    What is the 19th term of 10, 7, 4, 1, …
20. 20.
    What is the 17th term of 9, 18, 27, 36, …

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