I see the worksheet you've uploaded. Let's start by addressing specific problems you'd like help with! Could you specify which question you'd like assistance with? I can solve or explain any of them.

Here are the sections I can help with:

1. Understanding variables and operations on them.
2. Creating algebraic expressions.
3. Simplifying expressions.
4. Solving equations.
5. Word problems, such as those involving altitude and population models.

Let me know which part you'd like to explore!