Simplify the expression. Assume that all variables represent positive real numbers.
-3/7
A. x9/7y33/7
B. x54/7y33/7
C. x27/7y33/7
D. x9/7y12
Answer: A
Mathematics
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A. Domain: [4, ?); range: [0, ?) 
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D. Domain: [-4, ?); range: (-?, 0] 
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A. 
B. 
C. 
D. 
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