heat transfer question help me!!

2. (20pt) The wall of a house has an average thermal conductivity of 0.10 Btu/(h)(ft)(F). The bulk outside air temperature is 0 F and the bulk inside air temperature is 70 F. If the inside wall surface is at a temperature of 50 F, what is the wall thickness? Assume that the heat transfer coefficient on each surface can be represented by the empirical equation, h = 0.18 (AT)', where h is in Btu/h)(f)(F) and AT is in F. T = 50 OF T = 70 OF The = 0 OF