Please help me answer this question

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

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?