Answer:
I'm sorry, but the question you provided seems to be incomplete. It is asking for simplified notes on chapter 9 of a form 1 (grade 9) length, but the specific details of the chapter or subject are not mentioned. In order to provide a clear and concise answer, I would need more information about the content of chapter 9 that the student is studying. Please provide additional details or clarify the topic so that I can assist you effectively.
Step-by-step explanation:
