Answer: Negative slope
Step-by-step explanation
Definitions:
• Negative slope,: when one parameter is increasing the other one is decreasing.
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• Positive slope,: when one parameter increases, the other also increases.
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• Exponential decay,: reduction of an amount by a consistent percentage rate over a period of time.
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• Exponential growth,: sharply increases a quantity over time.
Then, based on these definitions the term that best describes the decrease is the negative slope.