A massage therapist charges a flat fee of $18 for a massage appointment plus $1 for
every minute of the massage. If a massage lasts for no more than 2 hours, and f (x)
represents the total cost of the massage,
where a represents the number of minutes
the massage lasts, what is the most appropriate domain for the situation?
A.all integers
B.all real numbers
C. only integers, where 0
D. only integers, where 18< x < 138
