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What is the correct answer ? Please explain !!
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What is the correct answer ? Please explain !!

What is the correct answer ? Please explain !!-example-1
User Nick Wright
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the correct answer is D because the z cancels each other out

think of it this way: -1z +1z=0
place a number in front to help you remeber there is a 1 in front of the variable
User Alfonso Presa
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