Final answer:
The correct formula for converting from degrees Celsius to Fahrenheit is
. On a warm day of 88°F, the temperature in Celsius is 31.11°C. The term 'centigrade' refers to the 100 degree scale between the freezing and boiling points of water.
Step-by-step explanation:
The formula to convert temperature from degrees Celsius to Fahrenheit is:

To answer your question, option 1) F = (9/5)C + 32 is the correct formula for converting Celsius to Fahrenheit. Using this formula, let's find out the Celsius temperature on a warm day that is 88°F:
T°C = (T°F - 32) / 1.8
T°C = (88°F - 32) / 1.8
T°C = 56 / 1.8
T°C = 31.11°C (rounded to two decimal places)
The Celsius temperature would be 31.11°C on a warm day of 88°F.
Concerning the second question, the Celsius scale is often called “centigrade” because it is based on a scale of 100, where the freezing point of water is 0°C and the boiling point is 100°C at standard atmospheric pressure.