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

The total cost for x months is the $50 registration fee plus $12 for each month, or 50 + 12x. To find the average monthly cost, divide the total cost by the number of months, x. This gives (50 + 12x)/x, which is choice B.

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