Which relation is a function?

a. {(1, 2); (1, 3); (1, 4); (1, 5)}
b. {(1, 2); (2, 3); (3, 4); (4, 5)}
c. {(1, 2); (2, 3); (3, 4); (2, 5)}
d. {(1, 2); (3, 2); (3, 3); (4, 2)}

b?

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.