- Two math questions I don't understand?

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What about oxidation reaction charge? Total surface of human body 1.2m^2
face temp. 30degree
surrounding 20degree
what is the heat loss from body by radiation? ? What is the partial pressure of N2 in a mixture of N2 and O2 having a total pressure of 1075 torr if the partial pressure of O2 is 720 torr? How can i determine crop coefficient of constructed wetland macrophytes? Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I?