Question

Eliza started her savings account with $100. Each month she deposits $25 into her account. Write the function that describes the relationship between the amount Eliza deposits and the total amount in her account. Then, determine the average rate of change in the account from the 2nd month to the 10th month.

Answer 1

Deposit per month = $25

Amount in account after x months = A(x)
A(x) = 25x + 100

The rate of change for every month is the same, $25, because $25 is deposited every month.