what is th edomain for this situation?

Question

An apartment building has a total of 120 apartments. The equation m(p) = 5p gives the amount of money made, in hundreds of dollars, when p apartments are rented. 

Answer 1

- They can't rent a fraction of an apartment, only a whole number of them
- They have 120 apartments, so that is the maximum they can rent

- They can be renting 0 apartments, if they're all vacant, but not a negative number

 

So the domain is all integers from 0 to 120.