Seudónimo Seudónimo
  • 02-03-2016
  • Mathematics
contestada

explain how you know to use a variable in an addition or subtraction expression

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Elephant4
Elephant4 Elephant4
  • 02-03-2016
If for example you do 4+3= ? instead of a question mark you can do    4+3= x or m or any letter.
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