Energy usage is measured in kilowatt-hours, kWh. After 7 a.m., energy usage on a university campus increases at a rate of 21% per hour. Prior to 7 a.m., 15,040 kWh have been used. The university's daily goal is to keep its energy usage less than or equal to 100,000 kWh.
Which inequality can be used to determine the number of hours, t, after 7 a.m. when the energy usage on campus will be less than or equal to 100,000?
