Table C represents a function
This is because each x value has only one y value. For the other tables, the x values of 4, 9, and 8 have 2 different y values.
318.50 divided by 100% and x30 = 95.55$ it's discount
318.50-95.55=222.95$ is their total bill after discount
What what language is that I think it is Spanish I don't speak Spanish I speak English sorry I can't help u