Rationality in mathematics is when a number is being expressed exactly by a ratio of two integers.
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A number is either irrational or it is not. Rationality or irrationality have nothing whatsoever to do with "to 0.12345".
I define an variable by saying x- an value
Define these Levels of Measurement.NominalOrdinalInterval/Ratio
4 points define a plane.
define cost and selling price