Can someone help me with this question pls (8th grade math)

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Orly uses 2 cups of raisins for every 12 cups of trail mix she makes. how many cups of trail mix will she make if she uses 8 cups of raisins?

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