Question

The function f(x) represents the amount of people it takes to build x engines in a car factory. What is a reasonable domain for the function f(x)?

Answer 1

The domain is all x-values of coordinate pairs.
But, if you need a reasonable domain for a graph, it should be all integers (whole numbers) greater than or equal to zero.
This is because you can’t have 1/2 of a person or 1/2 of an engine. You also can’t have any negative engines either. Therefore, the domain would need to be whole numbers greater than (or equal to 0).