Identifying terms of a linear function

A fitness club charges members an initial fee and a separate monthly membership fee. The equation of the function given models the total fee, f(x), in dollars,
that a person pays for x months of membership.

f(x) = 30x + 25
​
​What does the number 30 represent in this situation?

​A.) the initial membership fee
​B.) the monthly membership fee
​C.) the number of months that a person is a member
​D.) the total amount that a member pays in monthly fees

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The “x months of membership” would be multiplied by the monthly membership fee, while the initial membership fee would be added onto that,
creating the total amount paid.

In f(x) = 30x + 25,
f(x) is the total amount paid
30 is the monthly membership fee
x is the number of months of membership
25 is the initial membership fee

B.) the monthly membership fee

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