Please answer this I will give brainliest- Functions

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:

answer: the distance

step-by-step explanation:

to calculate the distance d of a line segment with endpoints (x1, y1) and (x2, y2) use the formula d (x2 x1)2 (y2 y1)2. to calculate the midpoint of a line segment with endpoints (x1, y1) and (x2, y2) use the formula