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How do you do 18-21 please help I don’t understand it

How do you do 18-21 please help I don’t understand it-example-1

1 Answer

7 votes
  • 18-21 Is -3
  • The reason that is the answer is when you look at a number like with a negative side like this for instance
  • -3 -2 -1 0 1 2 3
  • You’ll go into the negatives with is basically a backwards numberline hope this helps !
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