Write a recursive rule for the sequence. Then find a4.

Question

1. r = 1/5, a₁ = 125
2. a_n = 3 - 2n

Answer 1

1)

a_n+1 = a_n / 5, yet that is not helpful in determening a₄

a₄ = 125(1/5)³

2)

This is the recursive form.

a₄ = 3 - 2(4)