Question

Your bank account has -$21 in it and you deposit $6 per day. How much money is in your account after 4 days?

Answer 1

So the original amount of money in the bank account is given by a negative number: -$21. If you deposit $6 per day during four days then the total amount of money deposited by the fourth day is:

`4\cdot\text{\$}6=\text{\$}24`

The total amount of money in the account is given by adding the deposited money to the original amount:

`-\text{\$}21+\text{\$}24=\text{\$}3`

Then the answer is $3.