The rule of the interest is
[tex]A=P(1+r)^t[/tex]
Where:
A is the new amount
P is the initial amount
r is the interest rate in decimal
t is the time
Since Maile deposited $9000, then
P = 9000
Since the balance grew 4% per year, then
r = 4/100 = 0.04
Since the balance is for 7 years, then
t = 7
Substitute them in the rule above
[tex]\begin{gathered} A=9000(1+0.04)^7 \\ A=9000(1.04)^7 \\ A=9000.1.04^7 \end{gathered}[/tex]
The correct answer is C
