To convert a temperature from Celsius to Fahrenheit using the formula F = 1.8C + 32, you simply plug in the value of the temperature in Celsius (C) into the formula and calculate the corresponding temperature in Fahrenheit (F).
Given that the temperature is 30 degrees Celsius:
F = 1.8 * 30 + 32
F = 54 + 32
F = 86
So, when the temperature is 30 degrees Celsius, it is equivalent to 86 degrees Fahrenheit.