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quantities that can take many values; or letters that represent numbers in an algebraic expression or equation.
in set theory, a union between two or more data sets refers to all the elements in the data sets...
the value of one currency for the purposes of converting the value to that of another currency...
statistical data organised in a table. The data may be grouped or ungrouped.
an equation in which the highest power of a variable is 1. This means that the resulting graph...