A backsight of 7.76 ft. is taken on a turning point with an elevation of 2,325.58 ft. If the foresight taken on the top of a construction pin is 4.25 ft., the elevation (ft.) of the top of the pin is most nearly:.A. 2,313.57B. 2,322.07C. 2,329.09D. 2,327.59

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.