1. **Problem:** Select all pairs of numbers that have a product of 36. 2. **Formula:** The product of two numbers $a$ and $b$ is $a \times b = 36$. 3. **Check each pair:** - A. $3 \times 12 = 36$ (True) - B. $4 \times 9 = 36$ (True) - C. $6 \times 6 = 36$ (True) - D. $18 \times 18 = 324$ (False) - E. $-6 \times -6 = 36$ (True) - F. $-2 \times 18 = -36$ (False) 4. **Answer:** The pairs with product 36 are A, B, C, and E.