Idont understand how to do this math. it is comparing properties of functions

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

Tell me how you got the it use the figures to answer questions 1and 2. in each diagram, line k is parallel to line l, and line t intersects lines. 1. based on the diagrams, what is the value of x? 2. how would you verify your answer for x?

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?