Answer:

In 3x, 3 is constant and x is variable but together 3x is a variable.

Step-by-step explanation:

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Answer:

x& C

Step-by-step explanation:

variable in algebra, a symbol (usually a letter) stands in for a unknown numerical value in an equation commonly used variables include x and y

(real-number unknown ) z (complex - number unknowns ) ,t t

(time), r (radius) and s (arc length (