Using it's concept, it is found that the rate of change is of 190 clients per year.
Given a function, it is given by change in the output divided by change in the input.
In this problem, in 3 years, the number of clients increased by 820 - 250 = 570, hence:
r = 570/3 = 190.
The rate of change is of 190 clients per year.
More can be learned about the rate of change at https://brainly.com/question/24313700
