No it is not a function the are two inputs for one output
It's slightly ambiguous because the year isn't an even number of weeks, so sometimes that extra day falls on a weekend and sometimes on a weekday. We'll assume a weekend; that makes the numbers come out nice.
Total working days, 52 five day weeks minus 30 days vacation

So his daily rate is
dollars per day
Answer: A
It's closer to $518 when we count the extra day as a weekday.
This will be 18.39, 6 is higher than 5, so the 8 is going higher so it's a 9 and you will get 18.39
I believe it would be negative 9 because your subtracting by twelve again. I hope that helped
Multiply both sides by the reciprocal (-8/7). You would get 40/7 or 5.71428571