Because they add onto the expression with every step.
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I could help when you are dealing wit a hidden variable and will help solve the question. The expression has no answer so it shows the work.
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PEMDAS is an acronym to help you remember the order of operations in mathematical equations.First, you do expressions within Parenthesis and/or Exponents.Then, you do expressions involving Multiplication and/or Division.Finally, you do the expressions involving Addition and/or Subtraction.
Yes.
An equation has the 'equals' sign ( = ) in it. An expression hasn't.