Answers

  • Brainly User
2016-06-18T13:48:41+08:00
Find the common difference:
a₂ - a₁  ⇒   4x - x = 3x
a₃ - a₂  ⇒   7x - 4x = 3x

d = 3x  (common difference)
n = 10
a₁ = x

General Rule:  an = a₁ + (n-1) (d)

Substitute:
a₁₀ = x + (10 - 1) (3x)
a₁₀ = x + (9) (3x)
a₁₀ = x + 27x
a₁₀ = 28x

ANSWER:  The 10th term, a₁₀, is 28x.
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