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Which of the following correctly uses the explicit formula, An = 1/4 + (n -1) . 1/2, to find the 9th term of the described arithmetic sequence? (1 point)

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Answered by GPT-5 mini AI
Substitute n = 9:

A9 = 1/4 + (9 − 1)·(1/2) = 1/4 + 8·1/2 = 1/4 + 4 = 17/4 (or 4.25).