Frank joined a fitness club. He paid a $50 registration fee, and dues are $12 per month. Which expression can be used to find the average monthly cost of an x-month membership at the club?

Step-by-step explanation:
b is the answer y=50+12x/x
As we can get the information
the registration fee is fixed, but the dues is
increased with the Month.
so the average monthly cost
answer y=50+12x/x