Which option identifies the question the class should ask first in the following scenario? A high school economics teacher asks a computer class to teach his students the basic functions of Microsoft Excel.

how many times a week his class meets
what functions the students need to know
what kind of laptops the students have
how many seniors are in the class

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.