A variable is a symbol used to represent an unknown quantity. Often, variables represent fixed, but unknown, numbers. Variables are usually denoted with letters, such as x.x. 4x=8 4x=8 In this case xx is a variable in an equation that can be solved to identify the number. Alternatively, a variable can be used to represent a quantity that changes. Here is another example. Enrique’s weekly income varies, dependingon the number of hours he works.\begin{gathered} \text{Enrique's weekly income varies, depending}\\ \text{on the number of hours he works.} \end{gathered} In this case, Enrique's weekly income could be different from one week to the next, based on how much he works. The use of a variable here is appropriate because it is possible that the number of hours worked each week changes.

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