Step-by-step explanation:
Given , the amount of money in a bank account can be represented by the equation A(m) = 30m +180, where A(m) is measured in dollar and m is measured in month.
When A(m) = 1680
1680 = 30m +180
⇔30m = 1680 -180
⇔30m = 1500
⇔[tex]m= \frac{1500}{30}[/tex]
⇔ m = 50
It represents that , the amount of money in the bank account is $1680 after 50 months.