3. Each year Mark deposited a certain amount of money in an
account which pays an annual intrest rate of r so that at the end of
the each year the balance in the account is mulitpled by growth
factor of x=1 + r. $800 is deposited at the start of the first year, an
additonal $500 is deposited at the start of the next year, and $300
at the start of the following year.
a. Write an expression for the value of the account at the end of
three years in terms of the growh factor x. (2 pt)
b. Dale also deposited money into his own account. His expression
is represented by
1000x5 + 800x4 + 200x2 + 500x + 700
In the past 5 years, Dale made a deposit every year except for
which year? (1 pt)