You deposit $9000 in a savings account that earns 3.6% annual interest compounded monthly. You also save $40 per month in a checking account.

a. Write a function $s$ that represents the balance (in dollars) of your savings account after $t$ years.

$s\left(t\right)=$
Question 2
b. Write a function $B$ that represents the total amount saved after $t$ years.
$B\left(t\right)=$
9000\left(1+\frac{0.036}{12}\right)^{12t}+40\left(\left(\frac{1+0.036}{12}\right)^{12t}-1\right)
Question 3
Find $B\left(3\right)$ .
$B\left(3\right)=$ $