Let's go over the questions from the image you've uploaded:

Question 43:
"Choose the appropriate expression that is 3 times bigger than y."
The correct expression is:

• $3y$
  This represents y multiplied by 3, which is exactly 3 times bigger than y.

Question 44:
"Simplify: $2x + 5y + x - y$"
To simplify this, we combine like terms:

• $2x + x = 3x$
• $5y - y = 4y$
  So the simplified expression is:
• $3x + 4y$

The correct answer is:

• $3x + 4y$

Would you like more details on these solutions or further explanations?

Here are 5 related questions for practice:

1. What expression would be 5 times bigger than y?
2. How would you simplify $4a + 2b + 3a - b$?
3. What is the result of multiplying $2x + 3$ by 3?
4. What happens when you subtract $5z$ from $7z$?
5. How would you expand $2(x + 3y)$?

Tip: When simplifying expressions, always group and combine like terms (those with the same variable) to make your calculations easier.