1. The problem asks to write an expression for the sequence of operations: add 3 to 5, then divide $z$ by the result. 2. First, add 3 to 5: $$5 + 3$$ 3. Then, divide $z$ by the sum obtained: $$\frac{z}{5 + 3}$$ 4. The expression is $$\frac{z}{5 + 3}$$ and we do not simplify it as per the instructions. This expression correctly represents the described operations.