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The drama club found that the best price for renting a fog machine was for every three days, plus a one-time delivery fee. Make a step graph that shows the cost of renting the fog machine for up to three weeks.

A step function is a special kind of piecewise function (a function composed of parts of two or more functions). A step function has a graph that is a series of line segments that often looks like a set of steps.

The endpoints of the segments on step functions are either open circles (indicating this point is not part of the segment) or filled-in circles (indicating this point is part of the segment).