A variable is an unknown number represented by a letter
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The question should be what is the variable in the following expression? (n + 5) The answer: (n) represents the variable. See: Variable(English definition) then look up the Math/Algebra definition.
A number without a variable. Ex.) 5 is a constant, 5x is not.
Usually it refers to the straight line regression of a variable against time.
operational definition of a manipulated variable
In Algebra a term is either: * a single number, or * a variable, or * numbers and variables multiplied together.