Question

Last spring Steve joined a health club. The club charges a one-time enrollment fee of $150.00 plus a $25.00 monthly fee. Let n represent the number of months Steve pays for membership.

Which of the following best represents the domain of the situation?

Answer 1

You haven't added any of 'the following' for the question.

However, if you're asking for the domain of 'n', this refers to all the possible values 'n' can have.

n is the number of months.
So,
n cannot be negative
n cannot have a decimal point

Hence, n must be a whole number, and its domain is the set of all whole numbers.