Let any variable such as x represent the least amount of money that Malcolm needs to deposit. His balance from his checking account is $638.54. Subtract $159.50 from this amount.
With the condition that he must maintain $500, the inequality becomes,
(638.54 - 159.50) + x <span>≥ 500
479.04 + x </span><span>≥ 500
x </span><span>≥ 20.96</span>
-5.4c (I am not quite sure if I am correct)
If there is a 5% drop every month, then the class becomes 1-5%=1-0.05=0.95 times the previous size.
The formula for

months would be

so for 12 months it would be
12=9h
12/9=h
4/3=h
4/3 units, or 1 1/3 units