Answer
B and C.
Work Step by Step
Based on the given conditions, expressions B and C can be simplified:
B. $\frac{-x-4}{x+4}=\frac{-(x+4)}{x+4}=-1$
C. $\frac{x-4}{4-x}=\frac{x-4}{-(x-4)}=-1$
Thus the answers are B and C.
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