Answer: ( No need for explanation due to it being a mathematical word/essay sort of problem )
The term “ exponential growth “ can refer to a very rapid increase in numbers while the term “ exponential decay “ refers to very rapid decrease in number.
You can tell by the second word in the exponential
Growth = Rising
Decay = Falling
Thus the answer to your problem is,
The term “ exponential growth “ can refer to a very rapid increase in numbers while the term “ exponential decay “ refers to very rapid decrease in number.