X = {(2, 4), (3, 4), (4,4), (5, 4)) Is x a function and why?

Because they all have a different x number. Even though the y numbers are the same you can tell wether a set of numbers are a function by the x numbers. So since there are different x numbers it is a function. I hope this helps!

However, if the workers do outside of what's normally expected, go ahead and tip.