`504 ÷ 42 xx 7 - 63 + 28 =?`

Options

A. `7^2`
B. 48
C. `6^2`
D. 38

Answer

To solve the expression \( 504 \div 42 \times 7 - 63 + 28 \), we will follow the BODMAS rule (Brackets, Orders, Division and Multiplication, Addition and Subtraction).

### Step-by-step Solution:

1. **Identify the operations**: The expression consists of division, multiplication, subtraction, and addition. According to BODMAS, we will first perform division and multiplication from left to right.

2. **Perform the division**:
\[ 504 \div 42 \]
To calculate this, we can simplify:
\[ 504 \div 42 = 12 \]
So, we rewrite the expression:
\[ 12 \times 7 - 63 + 28 \]

3. **Perform the multiplication**:
\[ 12 \times 7 = 84 \]
Now, we rewrite the expression again:
\[ 84 - 63 + 28 \]

4. **Perform the subtraction**:
\[ 84 - 63 = 21 \]
The expression now looks like:
\[ 21 + 28 \]

5. **Perform the addition**:
\[ 21 + 28 = 49 \]

Thus, the final answer is:
\[ \boxed{49} \]