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As a function of x, area is expressed as:

In this function, x is the independent variable. It means that when x (domain) changes, y (range) changes.

Example:

If x = 4 meters, then:

f(4) = (4 m)²

f(4) = 16 m²

If x = 7 meters, then:

f(7) = (7 m)²

f(7) = 49 m²

It means that the area of a square is dependent on the measure of its side.