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