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.

step-by-step explanation:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

step-by-step explanation:

given that megan owns a clothing boutique.

the profits of 2010, 11, are recorded and shown as follows:

years since     2010 0     1     2     3       4       5

profits made in 1000's   39       84     111     120   111     84

we find that profit gradually increases form 2010 to 2013 upto 120,   then starts decreasing.

the profits for 2012 and 2014 are the same while that of 2011 and 2015 are also the same.

this shows that there is symmetry about the line profit = 120000

hence answer is:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

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step-by-step explanation: