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A variable is assigned to represent an unknown quantity.
Nothing specifically is "done" to the variable; variables are generally used to represent either:* A quantity that is initially unknown (and should be solved for), or * A quantity that can be anything - to analyze what happens no matter what a certain value is.
I don't really know but usually it is done with one variable. If it has two variables there might be two unknown anwers to the equation.
A dependent variable is usually on the side of the equation by itself. The independent variable usually has something being done to it. And, the dependent variable is usually written to the left of the equation.
task variable refers to the task being done in an experiment.......eg-in recall and recognition measure experiment task variable is making lists