Answers

  • Brainly User
2016-07-25T10:05:54+08:00
A₁ = 2        n = 18     an/a₁₈ = 87           d = ?

an = a₁ + (n-1) (d)

87 = 2 + (18-1) (d)

87 = 2 + 17d

17d = 87 - 2

17d/17 = 85/17

d = 5

ANSWER:  The common difference is 5.


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