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We are given the expression \( x - y + z \), and the values \( x = -13 \), \( y = -9.3 \), and \( z = 7.2 \).

Let's substitute these values into the expression:

\[
x - y + z = (-13) - (-9.3) + 7.2
\]

### Step-by-Step Evaluation:

1. First, handle the subtraction of a negative number:
   \[
   (-13) - (-9.3) = (-13) + 9.3 = -3.7
   \]

2. Now, add \( z = 7.2 \):
   \[
   -3.7 + 7.2 = 3.5
   \]

Thus, the value of the expression is:

\[
\boxed{3.5}
\]

Let me know if you'd like further details or have any questions! Here are some related questions to consider:

1. What happens if \( x \), \( y \), and \( z \) are all positive?
2. How does changing \( z \) affect the result?
3. Can this expression be written differently to make calculations easier?
4. What if \( y \) were positive—how would that affect the result?
5. How would you solve this if all variables were decimal numbers?

**Tip**: When subtracting negative numbers, remember it turns into addition, making the calculation easier!

Evaluate the expression when x = -13, y = -9.3, and z = 7.2. Expression: x - y + z.

Learn how to evaluate the expression x - y + z when x = -13, y = -9.3, and z = 7.2. This solution covers key arithmetic concepts such as the subtraction of negative numbers and addition of decimals. Suitable for students in Grades 6-8.

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