We start off with 100 dollars. Which in this case Eliza deposits 25 every month.
What is average rate of change?
It is a measure of how much the function changed per unit, on average, over that interval
So this meaning that
25x + 100 would be are main focus here.
Replace x with 2 since we are finding the change of the 2nd account
25(2) + 100 = 150
Do the same problem but replace x with 10
25(10) + 100 = 350 dollars
So the average rate of change would be 25 dollars
:)