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Let's walk through the problem visible in the image.

### Problem Recap:
- **Gas price per gallon:** \$2.389  
- **Tank size:** 12.5 gallons  

**Part A asks:**  
Write an expression to calculate the cost of filling the 12.5-gallon gas tank.

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### Solution:
If each gallon costs **\$2.389**, then to find the total cost of **12.5 gallons**, we multiply the price per gallon by the number of gallons.

**Expression:**
\[
2.389 \times 12.5
\]

When we compute it:
\[
2.389 \times 12.5 = 29.8625
\]

So, the total cost to fill the gas tank is **\$29.86** (rounded to the nearest cent).

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Do you need further details or have other questions? Here are some follow-ups you might consider:

1. How do you handle multiplication of decimals in manual calculations?
2. What happens if gas prices fluctuate? How would that change the equation?
3. Can you automate this process for multiple tanks with different sizes?
4. What if the gas station offers a discount? How would that change the expression?
5. How does rounding affect the final cost?

**Tip:** Always round to two decimal places when dealing with currency to align with common financial practices.

How much does it cost to fill an empty 12.5-gallon gas tank if the price of a gallon of gasoline is $2.389?

Learn how to calculate the total cost to fill a 12.5-gallon gas tank when the price of gasoline is $2.389 per gallon. The solution involves simple multiplication of the price per gallon and the number of gallons. Ideal for students in Grades 6-8.

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