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Answer:
Step-by-step explanation:
a. The initial value (cost) of $125 is paid up front. It only provides the right to pay $20 each month the gym is used.
b. The rate of change (from $125) is $20/month. It is the monthly cost of membership.
c. Total cost = $125 + $20x, where x is the number of months you are a active member.
d. The rate of change is a constant $30/month.
e. It is direct variation. The more months, the more it costs at a fixed rate of $20/month.