Final answer:
The question likely asks for the temperature change in Celsius from a 40.0°F change, so if one side is 4°C and there is a 40.0°F drop, the other side would be -18.2°C after applying the conversion formula.
Step-by-step explanation:
The question appears to involve converting temperatures from Fahrenheit to Celsius, which falls under the subject of Physics, specifically thermodynamics. The level of knowledge required to calculate temperature conversions is typically covered in high school curriculum. To find out how many degrees Celsius the temperature decreases with a 40.0°F decrease, we can use the conversion formula: °C = 5/9 (°F - 32). A 40.0°F change in temperature results in a corresponding change in Celsius temperature of 5/9 * 40.0°C, which equals 22.2°C. So, if the current temperature on the left side reads 4°C, a decrease of 22.2°C due to a cold front would result in a temperature of -18.2°C on the right side. Note that the question provided does not clearly specify this scenario, but inferring from the context given and common assignments, this is a likely interpretation. If there's more context available in the question that might relate to a specific formula or setup, please provide it, as this will help in giving the most accurate response.