Answer:
where n>1
Step-by-step explanation:
Given

Required
Determine the recursive formula
The given sequence shows arithmetic progression (AP).
First, we calculate the common difference (d):


The recursive formula of an AP is determined using:
where 
Substitute 3 for d
where 
Given:
Jamie receives 15% commission on magazine subscriptions.
One week her sales totaled $860.
To find:
Her commission.
Solution:
We have,
Total sales of one week = $860
Rate of commission = 15%
Now,




Therefore, the amount of commission is $129.
I typed right on the problem set.