4

Not sure what you want with just "4". Do you want four practice questions, four steps for a method, or are you giving me a problem whose answer is 4? If you’d like, I can: - Generate 4 quick practice problems in a subject of your choice (with solutions) - Walk you through a 4-step solution to a problem - Solve a problem you paste, step by step Please tell me: - Subject and level (e.g., calculus (undergrad), linear algebra, statistics) - Whether you want theory, or problem-solving practice - Any specific topics you want included If you want, I can start with 4 calculus problems right now.