Final answer:
The difference between 3°C and -4°C is 7°C. When converting a temperature change from Fahrenheit to Celsius, the Celsius change is nine-fifths of the Fahrenheit change.
Step-by-step explanation:
The question is asking for the difference in temperature between 3°C and -4°C. To find this difference, you subtract the lower temperature from the higher one, so in this case, you would calculate 3°C - (-4°C), which becomes 3°C + 4°C, equalling 7°C. Therefore, the difference in temperature is 7°C, which is option a) 7°C.
To address part (b) of the question involving Fahrenheit and Celsius scale conversion, the formula for converting a change in Fahrenheit to a change in Celsius is: ΔC = (5/9) × ΔF. If you have a temperature change of 40.0°F and apply the conversion formula, it becomes ΔC = (5/9) × 40.0°F, which gives a temperature change of about 22.2°C in Celsius. This demonstrates that any change in temperature in Fahrenheit degrees is indeed nine-fifths the change in Celsius degrees.