What are these two music notes ☹️ help me

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

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite