Serena works 12:22 hours for earning 110$ on monday
The total amount Serena earns is the sum of her regular wage and the tips. The amount she earns from the wage is equal to 9h. This total should be more than or equal to $110. This is mathematically expressed as,
9h + 15 ≥ 110
Hourly rate: $9
daily tips: $15
minimum earnings: $110
The inequality that represents h, the number of hours she worked Monday is:
9h + 15 ≥ 110