Which of the following relations is not a function?

A. { (0,1), (1,1), (2,1), (3,1)}
B. { (0,0), (3,4), (5,6), (8,9)}
C. { (0,1), (0,2), (0,3), 0,4)}
D. { (0,0), (2,2), (4,4), (6,6)}

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

If rt is greater than ba, which statement must be true ?