4

I’m not sure what you mean by “4.” Do you want:

• A 4-question practice set on a topic you choose (with solutions)?
• Help solving problem 4 from a worksheet (paste the problem text)?
• A quick explanation of a topic labeled as Unit/Chapter 4 in your course?

Tell me the subject (e.g., Calculus, Linear Algebra, Stats), level (undergrad/grad), and any topic you want. If you’d like, I can start right away with four calculus problems.