Thermodynamics . Help would be greatly appreciated since i have a major test tomorrow!?

A 4m*5m*6m room is to be heated by baseboard resistance heater. it is desired that the resistance heater be able to raise the air temperature in the room from 7C to 23C within 15 minutes. uming no heat losses from the room and an atmospheric pressure of 100KPA.determine the required power of the resistance heater. ume constant specific heats at room temperature