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Find an equation of the tangent plane to the surface given by z = f (x,y )= Calculate the density (in g/L) of Freon-12, CF2Cl2, at 28.6°C and 0.984 atm.? Formula for calculating single extraction quizes? What are some things that are significant relating to technology? How can neutrally charged objects (skin, clothing) emit infrared radiation if neutral charges don't emit electric field lines?