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The question asks to identify which number line correctly models the subtraction \(12 - 18\) and also to compute the result of \(12 - 18\).

### Step 1: Interpret the problem
The subtraction \(12 - 18\) can be interpreted as starting at 12 on the number line and moving 18 units to the left, since subtracting a number moves left on the number line.

### Step 2: Analyze the number lines
1. **First number line**: The arrow starts at \(12\) and moves to the right, indicating an addition or a positive change.
2. **Second number line**: The arrow starts at \(12\) and moves to the left, indicating a subtraction or a negative change.

Since \(12 - 18\) involves moving to the left, the second number line is the correct model for this subtraction.

### Step 3: Perform the subtraction
\[
12 - 18 = -6
\]
The result of the subtraction is \(-6\).

### Conclusion
- The second number line correctly models \(12 - 18\).
- The result of the subtraction \(12 - 18 = -6\).

Would you like more details or have any further questions?

Here are five related questions:
1. What does subtracting a larger number from a smaller number represent?
2. How do you graphically represent addition on a number line?
3. What are the rules for subtracting negative numbers?
4. How can number lines help visualize absolute value?
5. What is the significance of zero on a number line during subtraction?

**Tip**: When subtracting numbers, always check if you're moving left (subtracting) or right (adding) on a number line to visualize the result.

Learn how to model subtraction on a number line with 12 - 18. Understand the steps to move left on the number line when subtracting larger numbers from smaller numbers. Ideal for students in Grades 3-4.

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