Answer:

11. 19

12. 65

13. 242

14. 41

15. 256

Step-by-step explanation:

11. just add 4

12. 5-9=4, 17-9=8, 33-17=16, 65-33=32

13. 2x3+2=8, 8x3+2=26, 26x3+2=80

14. 1x3-1=2, 2x3-1=5, 5x3-1=14, 14x3-1=41

15. 1x4=4, 4x4=16, 16x4=64, 64x4=256