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.