1. The problem asks to match each description (A, B, C, D) to the correct graph (1, 2, 3, or 4) based on the characteristics of the graphs and the descriptions. 2. Description A: "A person's height as a function of age" typically increases and then levels off as growth stops. This matches a curve that rises quickly and then levels off, which is Graph 4. 3. Description B: "Area of a circle as a function of its radius" follows the formula $$A = \pi r^2$$, which is a quadratic growth starting near zero and curving upward. This matches Graph 1. 4. Description C: "Number of hours of daylight as a function of the day of the year" is periodic, oscillating above and below an average value, matching a wave-like curve. This matches Graph 2. 5. Description D: "Volume of water in a leaking pool as a function of time" decreases linearly or steadily over time, matching a straight line decreasing from a high value to zero. This matches Graph 3. 6. Therefore, the matches are: - A: 4 - B: 1 - C: 2 - D: 3 7. The four-digit answer recording these matches in order A, B, C, D is: 4123.