For this case we have a function of the form:

We will evaluate the function for different values of x:
For x = 1:
For x = 2:
For x = 3:

We note that for each value of x, the function is 5 times greater than the previous value.
Answer:
The multiplicative rate of change of the function is:
5
The function is 5 times greater for each value of x.