3. Inside an air-conditioned room, the temperature is 18°C. After tuming it off for one hour, the temperature changes to 28.4°C. How many "C is the temperature difference? 4. Carl is not feeling well after playing, so his mother used a thermometer to measure his temperature. The thermometer read 38.5°C. How many degrees in Celsius) is his temperature higher than the normal body temperature? 5. The temperatures on three different days were 26.6°C, 28.2°C 29.2°C. What was the average?​