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The problem asks you to use a double number line to show the price of tomatoes. According to the text, **4 pounds of tomatoes cost $14**. We need to find the price of 1, 2, and 3 pounds of tomatoes and mark them on the number line.

### Steps:
1. First, find the price per pound of tomatoes. Since 4 pounds cost $14, we divide to find the unit rate:
   \[
   \frac{14}{4} = 3.5
   \]
   So, 1 pound of tomatoes costs **$3.50**.

2. Now, use this information to calculate the prices for 1, 2, and 3 pounds:
   - **1 pound**: $ 1 \times 3.5 = 3.5 $
   - **2 pounds**: $ 2 \times 3.5 = 7 $
   - **3 pounds**: $ 3 \times 3.5 = 10.5 $

### Marking on the number line:
- For **1 pound**, mark **$3.50**.
- For **2 pounds**, mark **$7.00**.
- For **3 pounds**, mark **$10.50**.
- **4 pounds** is already marked as $14.

Would you like details on how to draw the ticks or further explanation?

Here are some follow-up questions to expand your understanding:
1. What is the unit rate of tomatoes in dollars per pound?
2. How do you find the cost of half a pound of tomatoes?
3. If 5 pounds of tomatoes were bought, what would be the total cost?
4. How can you represent this problem using a proportion?
5. How does a double number line help in solving rate problems?

**Tip**: Always check your calculations by multiplying back to confirm the relationships on the number line are correct!

The double number line shows that 4 pounds of tomatoes cost $14. Draw tick marks and write labels to show the prices of 1, 2, and 3 pounds of tomatoes.

Learn how to calculate the cost of tomatoes using a double number line. This problem helps students understand unit rates and proportional relationships, perfect for grades 5-7. Explore how to mark 1, 2, and 3 pounds on the number line when 4 pounds cost $14.

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