Which sequence can be defined by the recursive formula f (1) = 4, f (n + 1) = f (n) – 1.25 for n ≥ 1?

The first term is f(1) = 4. Each next term is 1.25 less than the previous term: 4 − 1.25 = 2.75, then 2.75 − 1.25 = 1.5, then 1.5 − 1.25 = 0.25, and then 0.25 − 1.25 = −1. This matches the sequence 4, 2.75, 1.5, 0.25, −1, . . . .

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