Express the terms of the following sequence by giving an explicit formula. 9, 12 15, 18, 21 A. u(n) = n + 3, where n

Question

Express the terms of the following sequence by giving an explicit formula.

9, 12 15, 18, 21

A. u(n) = n + 3, where n = 1, 2, 3, 4, . . .
B. u(n) = 6 + 3n, where n = 1, 2, 3, 4, . . .
C. u(n) = 3 + n, where n = 1, 2, 3, 4 . . .
D. u(n) = 3n, where n = 1, 2, 3, 4, . . .

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Thu Giang 6 months 2021-07-21T19:59:03+00:00 1 Answers 2 views 0

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    2021-07-21T20:00:26+00:00

    Answer:

    B.

    Step-by-step explanation:

    The common difference is + 3 so we have an arithmetic sequence.

    u(n) = a1 + d(n – 1)

    = 9 + 3(n – 1)

    = 9 + 3n – 3

    = 6 + 3n.

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