Final answer:
The temperature now is -9.3°C after a decrease of 4.3°C from -5°C. Temperature conversions reveal that a 40.0°F decrease is equivalent to about 22.2°C.
Step-by-step explanation:
The temperature at noon was -5°C. If the temperature then decreased by 4.3°C, we would perform a simple subtraction to find the new temperature. Here's how the calculation is done:
-5°C - 4.3°C = -9.3°C
Thus, the temperature now is -9.3°C.
Regarding temperature conversions, if a cold front drops the temperature by 40.0° Fahrenheit, the temperature change in Celsius can be calculated using the relationship that any change in Fahrenheit degrees is nine-fifths the change in Celsius degrees. Therefore, the decrease in Celsius is (40.0/1.8) which is approximately 22.2°C.
The Celsius scale, also known as the centigrade scale, is a modern standardization which differs from the old centigrade scale by less than 0.1°.