If a=-1, which of the following is(are) true?

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If a=-1, which of the following is(are) true?
I. a^a=-|a| II. a^0=-a^-1 III. |a|=a
A. I only
B. II only
C. III only
D. I & II only
E. I , II & III only

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by Max@Math Revolution » Thu Aug 25, 2016 5:20 pm
From (-1)0=1, (-1)-1=-1, |-1|=1, the correct answer is D.