Answer:
-40°F = -40°C
Step-by-step explanation:
To convert Celsius to Fahrenheit, the following equation is used:
F = 1.8C + 32
When the temperature on the Fahrenheit scale is the same on the Celsius scale, that means F = C. Substituting:
C = 1.8C + 32
0 = 0.8C + 32
-0.8C = 32
C = -40
Therefore -40°F = -40°C.