Your question implies a multiple choice answer but you haven't give us what the multiple choices are....
Can you check your question again and finish writing up the entire thing?
All the best
Lori

Lori H.
tutor
Jack
I assume all those answers are negative numbers except c which is 18. That would have to be the answer. You can't win negative games!
Lori
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11/09/15
Jack C.
11/09/15