6. Solve the following expressions: 18 - (15 - 7) 40 + (9 + 13)

Step-by-step solution:

1. Step 1: Calculate the first expression: 18 - (15 - 7).
   First, solve the expression inside the parentheses: \( 15 - 7 = 8 \).
   Then, perform subtraction: \( 18 - 8 = 10 \).
2. Step 2: Calculate the second expression: 40 + (9 + 13).
   First, solve the expression inside the parentheses: \( 9 + 13 = 22 \).
   Then, perform addition: \( 40 + 22 = 62 \).

Answer: 10, 62