Final answer:
Using the formula C = (F - 32) × 5/9, the temperature of 100.4 F is converted to 38°C for the 4-month-old infant. Therefore, the correct answer is A) 38°C.
Step-by-step explanation:
The student is asking how to convert a temperature from Fahrenheit to Celsius. A 4-month-old infant has a temperature of 100.4 F. The formula to convert Fahrenheit to Celsius is: C = (F - 32) × 5/9. Using this formula, we can determine the Celsius temperature.
Let's calculate:
C = (100.4 - 32) × 5/9
C = (68.4) × 5/9
C = 342/9
C = 38°C
So, the correct answer to the question is A) 38°C.