Final answer:
Without an initial temperature and start time, we cannot calculate the exact temperature at noon; however, the process involves subtracting 3°C for each hour from the start time to noon.
Step-by-step explanation:
To determine the temperature at noon, we must know the initial temperature of the liquid and the time from the initial temperature measurement to noon. Without this specific information, we cannot provide a numerical answer. However, we can explain the process: if the temperature of the liquid changes by -3°C each hour, it means that the liquid's temperature decreases by 3 degrees Celsius for every hour that passes. If we assume the starting temperature at 8 AM is 25°C, for example, and we want to find the temperature at noon, which is 4 hours later, we would calculate this by subtracting 3°C per hour for 4 hours. That would be a total change of 12°C, so the temperature at noon would be 25°C - 12°C = 13°C.