What is your question? I don't see one, I am willing to help just need a question and i will try to help!
From what is there it is nearly impossible to find an exact number so I would say C... hope this helps
Answer:
1.28571428571
Step-by-step explanation:
9/7+1.2 in all
Common difference = 1/3 - 2/3 = 1-2 / 3 = -1/3
In short, Your Answer would be -1/3
Hope this helps!