4

I’m not sure what you want with "4." Do you mean:

• four practice questions on a topic,
• solving Problem 4 from a worksheet,
• or something else?

If you’d like, tell me the topic and level (e.g., calculus I, linear algebra, statistics, discrete math), and I’ll generate 4 practice questions. Or paste the full text of Problem 4 and I’ll walk through the solution step by step.