Answers

  • Brainly User
2016-06-18T18:41:49+08:00
General rule: 

an = a₁ + (n-1) (d)

a₁ = 9        d = 2

an = 9 + (n-1) (2)

an = 9 + 2n - 2

an = 2n + 9 - 2

an = 2n + 7    ⇒   ANSWER
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