Hello!!!
Our equation would be
290= 7.75 x h
H which stands for hours. Our equation can be simplfied to 7.75h
Next we must reverse our equation to work fully our.
290 divided by 7.75 is our final equation.
290 divided by 7.75 gets you 37.419 hours
If we want to average this out it is 37.4 hours, however people are not paid to work a percent of an hour.This means Anh, would have to work a full hour to get paid.
For our final answer, Anh must work 38 hours to make enough money to buy his stero.
I hope this helps & Good Luck.