It looks like you might be referring to something specific with "2.7." Could you clarify what you mean by that? Are you asking about a particular section from a math textbook, a problem you're working on, or something else?

Feel free to upload a photo or describe the context so I can assist you better!

Here are five possible questions related to common math topics in case you'd like to explore them:

1. How do you solve linear equations step by step?
2. What is the process for solving quadratic equations using the quadratic formula?
3. How do you calculate the derivative of a function in calculus?
4. Can you explain how to solve systems of equations using substitution or elimination?
5. What is the Pythagorean theorem and how is it applied in geometry?

Tip: When solving algebraic equations, always check your work by substituting your solution back into the original equation.