All it takes for a relation to be a function is for each possible first number of a pair there's only one possible second number.
So if any of the sets has two pairs with the same first number, that one's not a function.
The last one has (3,2) and (3,5) so isn't a function.
Answer:
it really depends on the taxation rate. I calculated texas, and it would be 4,434
Its a repeating decimal 0.22222222222222222222222
I honestly don’t know wish I could help
