The expressions in the image involve division by zero, which is undefined in mathematics. Let's analyze each expression:

1. $\frac{9}{0}$ — Division by zero is undefined.
2. $3 \div 0$ — Similarly, dividing 3 by 0 is also undefined.

Thus, both expressions are undefined.

Would you like to know more details or have any questions about these expressions?

Here are 5 related questions to consider:

1. Why is division by zero undefined?
2. What happens when a limit approaches division by zero?
3. How does zero affect multiplication and division?
4. What are the implications of undefined values in calculus?
5. Can division by zero be interpreted differently in different contexts, such as limits?

Tip: Always remember, in real number arithmetic, dividing any number by zero results in an undefined value.