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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, . . .

Respuesta :

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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