Which formula correctly converts Celsius to Fahrenheit?

• A. F = C/5 × 9 + 32
• B. F = (9/5)C + 32
• C. F = (C - 32) × 5/9
• D. C = 5/9 (F - 32)

Answer: (B)

To convert Celsius to Fahrenheit, multiply by 9/5 and then add 32. This captures how the Fahrenheit scale relates to Celsius: a degree change on Celsius corresponds to a 9/5 degree change on Fahrenheit, and 0°C equals 32°F. The standard form F = (9/5)C + 32 states this relationship directly. The alternative expression F = C/5 × 9 + 32 is the same calculation, because C/5 × 9 equals (9C)/5, which is the same as (9/5)C. So it also gives the correct Fahrenheit value. The other arrangements place the arithmetic in the wrong order for converting Celsius to Fahrenheit and are actually conversions from Fahrenheit back to Celsius.