brobro21 brobro21
  • 11-10-2018
  • Mathematics
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What is the correct answer ? Please explain !!

What is the correct answer Please explain class=

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ifalliam ifalliam
  • 12-10-2018
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
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