An electrician earns $110 after his first hour of working for a client. His total pay based on the number of hours worked can be represented using the sequence shown.110, 130, 150, 170, ...

The pay sequence is 110, 130, 150, 170, so the total increases by $20 for each additional hour. A recursive rule adds that increase to the previous term: f(n + 1) = f(n) + 20. Therefore, choice A, “f(n + 1) = f(n) + 20,” is correct.

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