Answer:
The function's domain is the interval
![[0,1,2,3,4,5,6]](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5hrk5139svg5c2jsjk3717x9vmcvguqmp8.png)
Explanation:
Let
x-----> the number of movies watched per month
y----> money charged by the cable company
we know that

so




therefore
The maximum number of movies per month is equal to

The function's domain is the interval
![[0,1,2,3,4,5,6]](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5hrk5139svg5c2jsjk3717x9vmcvguqmp8.png)