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9 December, 16:31

When we don't know the number in an algebraic expression, that is called

substitution

an operation

a variable

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Answers (2)
  1. 9 December, 17:08
    0
    When we don't know the number, we represent it as a letter such as x or y. These are called variables.
  2. 9 December, 20:05
    0
    This is called a variable
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