Question 20 Applications: Integer Subtraction Represent the application problem using subtraction in symbolic form and evaluate. Place all negative numbers in the symbolic form in parentheses. (Note: Make sure to use a subtraction statement even though an addition statement may apply as well). Don had 7 dollars in his checking account and wrote a check for 11 dollars. Write a symbolic expression using subtraction that represents this problem. $$ \square $$ What is the balance in Don's checking account in dollars? $$ \square $$ Carlos lowers the temperature of his freezer by 5 degrees. It was originally set to -8 degrees Celsius. Write the symbolic expression that represents this problem. $$ \square $$ What is the new temperature of the freezer in degrees Celsius? $$ \square $$ Malala's pool was filled 11 inches below the top of the pool. She drained the pool 12 inches. Write a symbolic expression using subtraction that represents this problem. $$ \square $$ What is the water level relative to the top of the pool? $$ \square $$ Callie had -12 dollars in her debit account. She returned an internet purchase and they removed a charge of 6 dollars from her debit account. Write a symbolic expression using subtraction that represents this problem. $$ \square $$ What is the new balance in Callie's debit account in dollars? $$ \square $$ Question Help: Video

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Sure, let's go through each application problem step by step, using subtraction to represent the scenarios and evaluating the results. Remember to place all negative numbers in parentheses in the symbolic expressions.

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### 1. Don's Checking Account

**Problem:**  
Don had 7 dollars in his checking account and wrote a check for 11 dollars.

**a. Symbolic Expression:**  
$$ 7 - 11 $$

**b. Balance Evaluation:**  
$$ 7 - 11 = \boxed{-4} $$  
*Don's checking account balance is **$$-4$$ dollars**.*

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### 2. Carlos's Freezer Temperature

**Problem:**  
Carlos lowers the temperature of his freezer by 5 degrees. It was originally set to -8 degrees Celsius.

**a. Symbolic Expression:**  
$$ (-8) - 5 $$

**b. New Temperature Evaluation:**  
$$ -8 - 5 = \boxed{-13} $$  
*The new temperature of the freezer is **$$-13$$ degrees Celsius**.*

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### 3. Malala's Pool Water Level

**Problem:**  
Malala's pool was filled 11 inches below the top of the pool. She drained the pool 12 inches.

**a. Symbolic Expression:**  
$$ (-11) - 12 $$

**b. Water Level Evaluation:**  
$$ -11 - 12 = \boxed{-23} $$  
*The water level is **23 inches below** the top of the pool.*

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### 4. Callie's Debit Account

**Problem:**  
Callie had -12 dollars in her debit account. She returned an internet purchase and they removed a charge of 6 dollars from her debit account.

**a. Symbolic Expression:**  
$$ (-12) - 6 $$

**b. New Balance Evaluation:**  
$$ -12 - 6 = \boxed{-18} $$  
*Callie's new debit account balance is **$$-18$$ dollars**.*

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**Summary of Results:**

1. **Don's Balance:** -4 dollars
2. **Carlos's Freezer Temperature:** -13°C
3. **Malala's Pool Water Level:** -23 inches
4. **Callie's Debit Account Balance:** -18 dollars

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Feel free to watch the accompanying video for a visual explanation of these problems!
1. **Don's Balance:** -4 dollars 2. **Carlos's Freezer Temperature:** -13°C 3. **Malala's Pool Water Level:** -23 inches 4. **Callie's Debit Account Balance:** -18 dollars

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