A,C,E,G,I What Is The Answer

Answer:
1. B. K
2. C. 12
3. C. 192
4. B. 42
5. A. 31
6. C. an = 7n + 4
7. C. 86
8. B. -8, -5, -2, 1, 4
9. A. 144
10. B. 221
11. A. Arithmetic
12. D. Adding
13. D. Arithmetic