This sequence represents the diameters of circles used to create an art project:2.5 cm, 3.1 cm, 3.7 cm, 4.3 cmLet f(n) represent diameter in centimeters and n the term number in the sequence. Which equation represents the sequence of diameters?

Each diameter increases by 0.6 cm, so the sequence is arithmetic with common difference 0.6. Since the first term is 2.5 cm at n = 1, the rule is f(n) = 2.5 + 0.6(n − 1), which simplifies to f(n) = 0.6n + 1.9. Therefore, choice A is correct; choice B would give 3.1 cm for the first term.

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