Final answer:
To convert 70 degrees Fahrenheit to Celsius, use the formula provided and you'll find it equals to approximately 21 degrees Celsius when rounded. Additionally, a 40.0°F decrease in Fahrenheit is roughly a 22°C decrease in Celsius.
Step-by-step explanation:
Converting 70 degrees Fahrenheit to Celsius
To convert 70 degrees Fahrenheit to Celsius, you would use the formula given: degree Celsius = 5/9 (degree Fahrenheit - 32). Plugging 70 into the formula gives us:
degree Celsius = 5/9 (70 - 32) = 5/9 (38) ≈ 21.111
When rounded to the nearest degree, 70 degrees Fahrenheit is approximately 21 degrees Celsius.
A 40.0°F decrease in temperature would equate to a change of:
5/9 (40.0°F) ≈ 22.222°C
However, when rounded, this is approximately a 22 degrees Celsius decrease. The factor 5/9 (or 0.555) is derived from the relationship between the Fahrenheit and Celsius scales, where a change in Celsius is nine-fifths the change in Fahrenheit degrees.