Which sentence represents a relationship between the number of visits to the gym that Denise makes and her total gym cost that results in a line with zero slope?
A. Denise pays an annual fee for an all-inclusive gym membership.
B. Denise pays an annual fee for a gym membership and $15 each time she chooses to take a spin class.
C. Denise pays $50 per month for 10 monthly visits, then $3 for each additional visit.
D. Denise pays $6 each time she visits the gym.
Answer (2)
Choice (A) has zero slope becsuse her cost doesn't depend on the number of visits.
The correct answer is A: Denise pays an annual fee for an all-inclusive gym membership, which results in a zero slope since her total cost does not vary with the number of visits to the gym.
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