How do you convert Celsius to Fahrenheit?

The method to convert Celsius to Fahrenheit is based on a specific mathematical formula that takes into account the temperature scales and their relationship. The correct formula is (9/5) * Celsius + 32.

This formula works because the Fahrenheit scale is divided into 180 equal intervals between the freezing and boiling points of water (32°F and 212°F), while the Celsius scale has a 100 interval range between the same freezing and boiling points (0°C and 100°C). Therefore, to convert Celsius to Fahrenheit, one must first multiply the Celsius temperature by 9/5 (which is the conversion factor reflecting the different scales), and then add 32 to align the two scales at the freezing point.

The other options present alternative calculations that do not accurately reflect the relationship between the two temperature systems. For example, multiplying Celsius by 1.8 and adding 30 does not yield the correct Fahrenheit temperature, nor does a formula that scales the Celsius temperature incorrectly or alters it without proper conversion. The final answer correctly uses the established conversion formula, ensuring accurate results when converting temperatures from Celsius to Fahrenheit.