Variable, In algebra, a symbol ( usually a letter ) standing in for an unknown numerical value in an equation. Commonly used variables include x and y ( real-number unknowns ), z ( complex-number unknowns ), t ( time ), r ( radius ), and s ( arc length ).
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Variable, In algebra, a symbol ( usually a letter ) standing in for an unknown numerical value in an equation. Commonly used variables include x and y ( real-number unknowns ), z ( complex-number unknowns ), t ( time ), r ( radius ), and s ( arc length ).