1. Evaluate $18 - 3^2 \cdot 2$. First, calculate the exponent: $3^2 = 9$. Then multiply: $9 \cdot 2 = 18$. Now subtract: $18 - 18 = 0$. 2. Evaluate $1 + (18 \div 6) \cdot 3$. Calculate inside the parentheses: $18 \div 6 = 3$. Multiply: $3 \cdot 3 = 9$. Add: $1 + 9 = 10$. 3. Evaluate $10 - 8 \div 2 + 7$. Divide first: $8 \div 2 = 4$. Rewrite expression: $10 - 4 + 7$. Calculate subtraction and addition from left to right: $10 - 4 = 6$. $6 + 7 = 13$. 4. Evaluate $4^2 - 2 \cdot (4 - 2)$. Calculate exponent: $4^2 = 16$. Calculate inside parentheses: $4 - 2 = 2$. Multiply: $2 \cdot 2 = 4$. Subtract: $16 - 4 = 12$. The answers correspond to: $18 - 3^2 \cdot 2 = 0$ (Answer B) $1 + (18 \div 6) \cdot 3 = 10$ (Answer E) $10 - 8 \div 2 + 7 = 13$ (Answer I) $4^2 - 2 \cdot (4 - 2) = 12$ (Answer D) The 4-letter code from these answers is: BEID