2-1

I’m not sure what you mean by "2-1." Do you mean:

• (a) arithmetic: 2 minus 1?
• (b) Section 2.1 in your textbook?
• (c) Problem 2-1 from an assignment?

If (a): 2 - 1 = 1.

If (b) or (c): please tell me the course and the textbook (or paste the full problem statement). I can give you a concise summary of Section 2.1 and a worked solution, or generate similar practice problems with solutions.

If you want, I can also create a quick 2-1 practice set tailored to your course (e.g., calculus, algebra, statistics, etc.). Just share the subject or syllabus.