slove a,b show work please

The sun is directly overhead, heating a roof. This heat is applied to a roof that has an emissivity of 0.70 and an absorptivity of 0.50 for radiation. Additionally, you may assume that the rate of heat transfer by conduction-convection q/A=0.42(T)1.40, where T is the temperature difference between the air and the roof in F. You may also assume that the radiation is transferred to an effective temperature value of 94F. The temperature of the air and surroundings may be assumed to be 75F. The roof has an equilibrium measured temperature of 98F. (a) Find the solar heat flux of the sun hitting the roof. (b) What fraction of the heat lost is from radiation at this temperature