Given an exponential function for compounding interest, a(x) = p(.91)^x, what is the rate of change? a. −0.09% b. −9% c. 0.91% d. 91%

The confirmed correct answer is -9%. Trust me.

Option B = -9%

Step-by-step explanation:

Given : Given an exponential function for compounding interest,

To find : What is the rate of change?  

Solution :

The general form of the exponential function is

Where,

r is the rate of change

if r> 1 then it is growth rate    

if r< 1 then it is decay rate.

Comparing given function with exponential function,

It is a decay rate.

Convert into percentage, multiply with 100

Therefore, Option B is correct.

The rate of change is -9%.      

because they could drop even lower..