Answer:
11. Each term increases by 5.
Next Terms: 25, 30, 35
12. Starts at 3, each term increases by 2.
Next Terms: 11, 13, 15
13. Each term's denominator increases by 1
Next Terms: 1/6, 1/7, 1/8
14. Each term decreases by 2
Next Terms: -8, -10, -12
15. Starts at 2, each term increases by 3.
Next Terms: 14, 17, 20