Quick please help The graph below represents the number of toys Rudolfo has in his toy box after x number of
months. Which equation below best represents this graph?

A. Y=15x
B. Y=30x
C. Y= 1/15x
d. y = 10x

I would say the answer is C

Step-by-step explanation:

Total Area = 9^2 = 81.

Part A: 
Area of white region/Total area = (Total area - Area of the black region)/Total area = (9^2-π(3/2)^2)/81 ≈ .91. That means it's closer to 1.

Part B:
Area of black region/Total area = (π(3/2)^2)/81 ≈ .09. That means it's closer to 0.

Explanation of work:

Area of the circle = πr^2. r = d/2. d=3. Therefore r = 3/2