30C = 86F
Using the question, F(c) = (9/5)C+ 32, substitute 30 in for Celsius in order to find the Fahrenheit equivalent.
F(c) = (9/5)(30) + 32
First, find (9/5):
(9/5) = 1.8
Next, multiple 1.8 by 30
1.8 * 30 = 54.
Finally, add 32.
54 + 32 = 86.
Therefore, 30 degrees Celsius is equal to 86 degrees Fahrenheit.