An amusement park charges an entrance fee of $20 and the rides cost $4 each. Suppose you write a function for the total cost of entering the park and riding any number of rides. What is the domain of the function based on the given context?
A) the set of whole numbers
B) the set of positive integers
C) the set of real numbers greater than 20
D) the set of non-negative real numbers
The domain of the function would be the set of positive integers, as the entrance fee and cost of the rides are defined for whole numbers of rides. Therefore, the correct answer is:
B) the set of positive integers