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Review: Definition: Less Than or Equal To
Explanation
Here we are given a definition for the pair of pointy
brackets, a definition which is unique to this question. <n> is less than n but the greatest value possible, "possible" meaning that it must
be an integer. Crudely, it's like, "barely less than n, rounded." So the barely-less-than-n-rounded number for 
is 
,
as it's the integer just left of -2.1 on the number line. Actually, that's a
better paraphrasal: the integer just left on the number line. We have
The correct answer is (D).
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