2-1

Could you clarify what you mean by "2-1"?

• If it's arithmetic, 2 − 1 = 1.
• If you mean Section 2.1 of a course, or Problem 2.1 from a worksheet, please share the exact statement or the course name.
• If you have a specific problem labeled 2-1, paste it here and I’ll help solve it and explain the steps.

If you want, tell me the course (e.g., Calculus, Linear Algebra, Statistics) and I’ll give you a quick summary of typical 2.1 topics and some practice questions.