2-9

Not sure what you mean by "2-9." A couple possibilities:

• If you meant the arithmetic 2 - 9, the result is -7.
• If you mean problems 2 through 9 in a chapter, please paste the problem statements (or tell me the subject, topic, and textbook) and specify whether you want quick hints or full solutions.

If you share the exact problems, I’ll walk you through them step by step. I can also provide a brief study plan or concept recap for the topic.