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A negative exponent indicates a reciprocal. The base in this term, 7,
is positive, so its reciprocal should be positive as well. 
is equal to  ,
not  .
So, we can eliminate any choice that contains Statement II, which are
Choices (B), (D), and (E).
We're left with Choices (A) and (C). Since Statement III alone appears
in Choice (C), we only need to evaluate this remaining statement to determine
the correct answer.
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