Answers

  • Brainly User
2016-06-15T09:01:02+08:00
General rule:  an = a₁ + (n-1) (d)

a₁ = 7    d = -5  ⇒ (2-7 = -5)       an = -18

-18 = 7 + (n - 1) (-5)
-18 = 7 -5n + 5
-18 = -5n + 12
5n = 12 + 18
5n = 30
5n/5 = 30/5
n = 6  or  6th term

ANSWER:  -18 is the 6th term of the give sequence 7, 2, ..., -18.
2 2 2