Answer
$-20^oC$
Work Step by Step
Substitute the given value of the $F$ into the expression:
$C=\dfrac {5}{9}\left( F-32\right) =\dfrac {5}{9}\left( -4-32\right) =\dfrac {5\times \left( -36\right) }{9}=5\times \left( -4\right) =-20$
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