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Let's analyze and solve the two parts of the question:

### a) Equivalent Expression to \( 4 - 2 + 16 \)
We simplify this expression step by step:
\[
4 - 2 + 16 = (4 - 2) + 16 = 2 + 16 = 18
\]
So, the equivalent expression is simply 18.

### b) Symmetric Property of \( 9 - 5 = 4 \)
The **symmetric property of equality** states that if \( a = b \), then \( b = a \). Applying this to the equation \( 9 - 5 = 4 \), the symmetric property would be:
\[
4 = 9 - 5
\]
Thus, the symmetric version of \( 9 - 5 = 4 \) is \( 4 = 9 - 5 \).

Do you want further details or have any questions?

Here are some related questions you might consider:
1. What is the commutative property in mathematics?
2. Can you give an example of the associative property?
3. How do you apply the distributive property in algebra?
4. What is an identity property of addition?
5. How does the reflexive property of equality work?

**Tip:** The symmetric property helps ensure that the order of equality does not affect the truth of the equation!

Choose the equivalent expression to 4 - 2 + 16. Choose the symmetric property to 9 - 5 = 4.

Learn how to simplify expressions like 4 - 2 + 16 and apply the symmetric property of equality to problems like 9 - 5 = 4. Suitable for Grades 6-8 students learning basic arithmetic concepts.

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