Answer:Here are the answers:1. **c. 5, 9, 13, ...**2. **a. 21**3. The 7th term of \(a_n = 2n - 1\) is **13** (not listed).4. The general term for 0, 3, 8, 15 is **b. \(a_n = n^2 - 1\)**.5. The common difference in \(a_n = n^2 - 1\) is **b. -2** (not listed).6. The general term for 9, 12, 15, 18 is **a. \(a_n = 3n + 6\)**.7. **b. Finite**8. **a. Term**9. The next three terms of -1, 2, 5, 8 are **b. 11, 14, 17**.10. **b. Arithmetic**11. The formula \(a_n = a_1 + (n-1)d\) is used to find the **c. nth term**.12. The common difference in the sequence 2, 5, 8, ... is **d. 3**.13. The arithmetic mean between two terms is **d. 14** (context-dependent).14. The tenth term \(a_{10}\) is **c. 43**.15. The seventh term of 9, 4, -1, -6, -11, -16, ... is **d. -31**.