Question

attachment below.

Answer 1

I would say it's not.

Answer 2

I've never seen this before. But if I were to guess the arrow represents a coordinate point? And If the left oval is the x-coordinate then this is not a function because of the points (2,0) and (2,-1) doesn't pass the vertical line test.

But like I said, that was all just a guess

Answer 3

I'm figuring it might just be like an in and out box but in circles.