A) Human skin is almost a perfect blackbody, with an emissivity of approximately 0.98. How much thermal power is radiate

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A) Human skin is almost a perfect blackbody, with an emissivity
of approximately 0.98. How much thermal power is radiated by a
person covered by 1.5 square metres of skin, at a surface
temperature of 34.4 degrees Celsius?
B) A foam insulation panel has an area of 1.9 m².
There is a temperature difference of 18.9 K maintained across
the panel. The thermal power conducted by the panel is
8.1 W.
(a) Calculate the U-value.
(b) Calculate the R-value.