An exponential model is of the form
If k > 0, then the model represents a growing quantity and k is called as the growth rate.
If k <0, then the model represents a decaying quantity and k is called as the decay rate.
So, we can tell whether an exponential model describes exponential growth or decay using the value of k.
Step 2
Conclusion:
Therefore, we can tell whether an exponential model describes exponential growth or decay using the value of k.