Use the formula f=9/5c+32 to convert -20 degrees f

c ≈ -29°

Step-by-step explanation:

To convert Fahrenheit to Celsius using the formula, substitute the degrees for Fahrenheit "f", then isolate Celsius "c".

f = + 32

-20 = + 32     Substitute "f" for -20

-20 - 32 = + 32 - 32     Subtract 32 from both sides

-20 - 32 =     +32-32 cancels out to 0. Simplify left side

-52 =

-52/ =     Divide by 9/5 on both sides

-52/ = c

-52 = c     When dividing a fraction, flip the fraction and change to multiplication

= c     Multiply by combining into the numerator

= c     Use a calculator

c = -28.8888888889°

c ≈ -29°      Round to the nearest degrees

Therefore -20°F is about -29°C.

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