`26.003 - 15.4001 + 6.995 = ?`

Options

A. a. 4
B. b. 18
C. c. 9
D. d. 10

Answer

To solve the expression \( 26.003 - 15.4001 + 6.995 \) using approximation, we will round each number to a simpler form and then perform the arithmetic operations.

### Step-by-Step Solution:

1. **Approximate Each Number:**
- Round \( 26.003 \) to \( 26 \).
- Round \( 15.4001 \) to \( 15.4 \) (or simply \( 15 \) for easier calculation).
- Round \( 6.995 \) to \( 7 \).

2. **Rewrite the Expression:**
- The expression now becomes:
\[ 26 - 15 + 7 \]

3. **Perform the Subtraction:**
- First, subtract \( 15 \) from \( 26 \):
\[ 26 - 15 = 11 \]

4. **Perform the Addition:**
- Now, add \( 7 \) to the result:
\[ 11 + 7 = 18 \]

5. **Final Result:**
- The approximate value of the expression \( 26.003 - 15.4001 + 6.995 \) is \( 18 \).

### Final Answer:
\[ \text{The answer is } 18. \]