1. The problem is to calculate $0.3 \times \sqrt{2.75}$.\n\n2. The formula used is multiplication combined with the square root function: $a \times \sqrt{b}$.\n\n3. First, calculate the square root: $\sqrt{2.75} \approx 1.6583$.\n\n4. Then multiply by 0.3: $0.3 \times 1.6583 = 0.49749$.\n\n5. Rounded to four decimal places, the answer is $0.4975$.\n\nThis completes the solution for the first problem.