a) \( 36+20 \div 5-6^{2} \div 9= \)

Let’s break down the expression step by step! First, we handle the divisions and the exponentiation: 1. Calculate \( 20 \div 5 = 4\) 2. Calculate \( 6^{2} = 36 \) and then \( 36 \div 9 = 4 \) Now, substituting these values back into the expression gives us: \( 36 + 4 - 4 \) Next, we perform the addition and subtraction from left to right: - First, \( 36 + 4 = 40 \) - Then, \( 40 - 4 = 36 \) So, the final answer is \( \boxed{36} \). Math is like a treasure hunt where each number leads you to the next clue; just remember to follow the order of operations for the "X" marks the spot!