SOLUTION: -1/2[ 12 + ( 12 - 1)) ]

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Question 331074: -1/2[ 12 + ( 12 - 1)) ]
Answer by Tutorteddy.Com(12) About Me  (Show Source):
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-1/2[ 12 + ( 12 - 1)) ]
= -1/2[12 + 11]
= (-1/2) X 23
= -23/2