Given:
\[
m = 5, \quad n = 3
\]

You are asked to evaluate the expression \( mn + 9 \).

Substitute the values of \( m \) and \( n \) into the expression:
\[
mn + 9 = (5)(3) + 9
\]

First, calculate the product of \( m \) and \( n \):
\[
5 \times 3 = 15
\]

Then, add 9 to the product:
\[
15 + 9 = 24
\]

So, the value of the expression \( mn + 9 \) is \( 24 \).

Would you like more details on this solution or have any questions?

Here are 5 related questions:
1. How do you evaluate expressions with multiple variables?
2. What is the order of operations when simplifying algebraic expressions?
3. How does changing the values of \( m \) and \( n \) affect the expression \( mn + 9 \)?
4. Can you create a different expression using the variables \( m \) and \( n \)?
5. What is the significance of evaluating expressions in algebra?

**Tip:** When solving expressions, always ensure that you follow the correct order of operations: parentheses, exponents, multiplication and division (from left to right), and addition and subtraction (from left to right).

Understand how to evaluate the expression m = 5 n = 3 mn + 9 step-by-step. This problem involves basic algebraic expressions, including multiplication and addition. Suitable for students in Grades 6-8.

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