The cost of 4 kilograms of cheese is 50 dollars. Which equation shows this in function notation?
ACost(4) = 50
BCost(50) = 4
CCost x 4 = 50
DCost x 50 = 4
ACost(4) = 50
BCost(50) = 4
CCost x 4 = 50
DCost x 50 = 4