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Mathematics 7 Online
OpenStudy (anonymous):

If n is 20, f(n) = 85. If n is 30, f(n) = 125. 20 and 30 are the minimum and maximum values of the domain. The function is linear and has a positive slope, so the minimum and maximum of the function are the values of the function at the minimum and maximum values of the domain, which are 85 and 125. Therefore, 4 is the right answer.

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