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The image you have uploaded shows several mathematical expressions involving the order of operations (often referred to as PEMDAS: Parentheses, Exponents, Multiplication and Division (left to right), Addition and Subtraction (left to right)).

Let me analyze and solve the problems for you.

1. **Problem 28**:  
   \( 3(8 - 4) \)

   **Solution**:  
   First, solve the parentheses:  
   \( 8 - 4 = 4 \)  
   Then multiply:  
   \( 3 \times 4 = 12 \)  
   **Answer**: \( 12 \)

2. **Problem 29**:  
   \( 18 \div (6 - 1) \)

   **Solution**:  
   First, solve the parentheses:  
   \( 6 - 1 = 5 \)  
   Then divide:  
   \( 18 \div 5 = 3.6 \)  
   **Answer**: \( 3.6 \)

3. **Problem 30**:  
   \( 3 \times [4 + (12 \div 4)] \)

   **Solution**:  
   First, solve the division inside the parentheses:  
   \( 12 \div 4 = 3 \)  
   Then solve the parentheses:  
   \( 4 + 3 = 7 \)  
   Finally, multiply:  
   \( 3 \times 7 = 21 \)  
   **Answer**: \( 21 \)

4. **Problem 31**:  
   \( \frac{9 - 7}{12 \div 3} \)

   **Solution**:  
   First, solve the subtraction in the numerator:  
   \( 9 - 7 = 2 \)  
   Then solve the division in the denominator:  
   \( 12 \div 3 = 4 \)  
   Now, divide the fraction:  
   \( \frac{2}{4} = 0.5 \)  
   **Answer**: \( 0.5 \)

5. **Problem 32**:  
   \( (6 \div 2) \times 5 \)

   **Solution**:  
   First, solve the division:  
   \( 6 \div 2 = 3 \)  
   Then multiply:  
   \( 3 \times 5 = 15 \)  
   **Answer**: \( 15 \)

Would you like more detailed explanations on any of these problems? Also, here are some related questions for further practice:

1. Solve \( 5 + 6 \times (3 - 1) \).
2. Simplify \( 4 \times (10 - 2) \div 2 \).
3. Solve \( (8 + 2) \div (3 \times 2) \).
4. Calculate \( 20 \div (2 \times 5) + 3 \).
5. Simplify \( \frac{18 + 6}{3} \).

**Tip**: Always start with operations inside parentheses and follow the PEMDAS rule (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).

The image contains various mathematical expressions focusing on the order of operations, also known as PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction). The problems include simplifying expressions like 3(8 - 4), 18 ÷ (6 - 1), and more.

Learn how to solve mathematical expressions using the PEMDAS rule (Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction). This page covers expressions such as 3(8 - 4), 18 ÷ (6 - 1), and more. Perfect for students in Grades 5-7.

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