omar worked 29 hours last month and earned $9 per hour. he spent $18 of his earnings since then. how much money does he have left?

To solve, we must find out how much he earned in the month. To do this, we do 29 x 9. This is done to find out how much was earned. Omar earned $261 in the month. Now we do 261-18 to find out how much is left after spending 18 dollars. We can see that Omar has $243 dollars remaining.