The exterior wall of a building is constructed of 12-in concrete (80 lb/ft^3), r-10 insulation and 0.375 in. gypsum board (50 ib/ft^3 density). the wall is 50 ft long and 10 ft high and there are six windows each with dimensions of 3w x 6h. the indoor temperature is 70f. location: denver, colorado. calculate (a) overall thermal resistance of the wall with r-10 insulation, (b) heat transfer coefficient of the wall with r-10 insulation, (c) heat loss through the wall with r-10 insulation. d) overall thermal resistance of the wall if the insulation is increased to r-20 (e) the reduction in the amount of heat loss through the wall if the insulation is increased to r-20