We use variables to: represent unknown quantities, represent relationships, use in formulas, act as parameters in equations, and describe properties of operations numbers. Identify the use of the variable.
a. The perimeter P of a rectangle with a length of l units and a width of w units is P = 2l + 2w units.
b. If a and b are any real numbers, then ab = ba.
c. Bob has three fewer coins than Carrie. A student writes the expression n – 3.
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