Answers

  • Brainly User
2016-06-18T17:31:12+08:00
Arithmetic Sequence General Rule:  an = a₁ + (n-1) (d)

a₁ = 12        d = 8

an = 12 + (n-1) (8) 

an = 12 + 8n - 8

an = 8n + 12 - 8

an = 8n + 4  Rule of the given sequence  12, 20, 28, 36

To find the a₂₅:
     a₂₅ = 12 + (25-1) (8)
     a₂₅ = 12 + (24) (8)
     a₂₅ = 12 + 192
     a₂₅ = 204

To find a
₅₅:
     a₅₅ = 12 + (55-1) (8)
     a₅₅ = 12 + (54) (8)
     a₅₅ = 12 + 432
     a₂₅ = 444

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