Answer:
Average rate of change between years 21 and 25 is 220.547475
Average rate of change between years 1 and 5 is 75.588
Explanation:
We are given
The function models the balance of an investment x years after it is made

Average rate of change between 21 and 25 years:
We can use formula

now, we can plug values



now, we can plug values


Average rate of change between 1 and 5 years:
We can use formula

now, we can plug values



now, we can plug values

