12. A scientist uses the expression 5/9(F - 32) to convert temperatures from degrees Fahrenheit (°F), F, to degrees Celsius (°C). To the nearest degree, what is the temperature, in °F, of a substance at -25°C?
Answer: C
The temperature of a substance at -25°C is -13°F.
To convert -25°C to Fahrenheit using the formula F = 9/5(C) + 32, the calculation yields -13°F.
A) 13
This option is incorrect because converting -25°C to Fahrenheit does not result in a positive number. The formula indicates that temperatures in Celsius below zero will yield lower Fahrenheit values.
B) -32
This option is incorrect as well. Applying the conversion formula to -25°C gives a result closer to -13°F, so -32°F is not a valid conversion outcome.
C) -13
This option is correct. Using the conversion formula, F = 9/5(-25) + 32, we find that -25°C corresponds to -13°F, which aligns with the calculation.
D) 18
This choice is incorrect. Converting -25°C to Fahrenheit results in a negative value, and 18°F does not reflect the correct transformation of the temperature.
Conclusion
The correct answer is -13°F, as derived from the conversion formula for temperatures. All other options fail to represent the conversion accurately, either yielding incorrect positive values or incorrect negative values that do not correspond to -25°C.