A temperature of 40 degrees C is equal to __________ degrees F.

• A. 98
• B. 126
• C. 104
• D. 158

Answer: (C)

Converting Celsius to Fahrenheit uses the formula F = (C × 9/5) + 32. For 40°C, multiply 40 by 9/5 to get 72, then add 32 to obtain 104°F. So 40 degrees Celsius is 104 degrees Fahrenheit. As a check, 0°C is 32°F and 100°C is 212°F, which fits that 40°C is between 32°F and 212°F. The other numbers don’t align with the formula: 98°F is about 36.7°C, 126°F is about 52°C, and 158°F is about 70°C.