At work, Brett must check and record the internal temperature of the freezer on an hourly basis. When working properly, the temperature should remain constant over time. What word describes the slope of a line showing the temperature of the freezer as a function of time in hours when the freezer is working properly?
When the freezer is working properly, its temperature stays constant as time passes. A graph of a constant value is a horizontal line, and a horizontal line has a slope of zero. So the correct choice is zero.
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