4

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

• A fourth practice problem in a subject (tell me the subject and level)?
• The solution to problem 4 from a worksheet you have (paste the problem)?
• A quick review of topic 4 from your course notes?
• Four practice questions now?

If you share the problem or topic (math, physics, CS, etc.), I’ll help with a step-by-step solution or generate relevant practice questions.