Here is the answer for the question
I believe 3b/6a which could reduce to b/3a.
Answer:
its B
Step-by-step explanation:
Answer: 
Step-by-step explanation:
The formula for finding the nth term of an arithmetic sequence is given as:

first term = -15
common difference = -6 - (-15) = 9
number of terms
substituting into the formula , we have :

