Please answer this I will give brainliest- Functions

Answer:
1. Not a function
2. function
3. function
4. not a function
5. function
6. function
7. not a function
8. not a function
9. function
10. not a function
11. function
12. function
13. not a function
14. function
15. function
16. not a function
17. not a function
18. Function
19. I can't see it properally sorry
20. Function
This took a long time to write -_-
Step-by-step explanation: