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The staircase represents a constant rate of change because the height of the staircase is always going up or down, or changing. Each time the staircase goes up by a certain number, it always goes up by the same number and is therefore a constant rate of change.
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Answer:

The staircase represents a constant rate of change because the height of the staircase is always going up or down, or changing.

Step-by-step explanation: this is becase Since x=4 is a vertical line, there is no y-intercept and the slope is undefined.

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