Can anyone help with Part D for this question? 1500W and 890W is incorrect. Thank you!

V Part C V Model the concrete slab as being surrounded on both sides (contact area 28 m2 ) with a 2.5mthick layer of air in contact with a surface that is 5.0 C cooler than the concrete. At sunset, what is the rate at which the concrete loses thermal energy by conduction through the air layer? Express your answer to two significant figures and include appropriate units. 1.3 W Previous Answers V Correct V Part D Model the concrete slab as having a surface area of 24 m2 and surrounded by an environment 5.0 O C cooler than the concrete. If its emissivity is 0.92, what is the rate at which the concrete loses thermal energy by radiation at sunset? Express your answer to two significant figures and include appropriate units.