Here are the solutions for each part: a) $\sqrt{64 \times 36}$ Method 1: Calculate the product first, then take the square root. $$ \sqrt{64 \times 36} = \sqrt{2304} = \boxed{48} $$ Method 2: Take the square root of each number, then multiply. $$ \sqrt{64} \times \sqrt{36} = 8 \times 6 = \boxed{48} $$ The statements give the same answer. This is because $\sqrt{a \times b} = \sqrt{a} \times \sqrt{b}$. b) $\sqrt{169 - 25}$ Method 1: Calculate the difference first, then take the square root. $$ \sqrt{169 - 25} = \sqrt{144} = \boxed{12} $$ Method 2: Take the square root of each number, then subtract. $$ \sqrt{169} - \sqrt{25} = 13 - 5 = \boxed{8} $$ The statements give different answers. This is because $\sqrt{a - b} \neq \sqrt{a} - \sqrt{b}$. c) $\sqrt{64 \div 16}$ Method 1: Calculate the division first, then take the square root. $$ \sqrt{64 \div 16} = \sqrt{4} = \boxed{2} $$ Method 2: Take the square root of each number, then divide. $$ \sqrt{64} \div \sqrt{16} = 8 \div 4 = \boxed{2} $$ The statements give the same answer. This is because $\sqrt{a \div b} = \sqrt{a} \div \sqrt{b}$. That's 2 down. 3 left today — send the next one.