Evaluate the double integral 
for the given function f(x, y) and the region R. 
; R is the rectangle defined by 
Definitions:
Surface Area
The total area of the surface of a three-dimensional object.
Active Transport
The movement of molecules across a cell membrane from a lower to a higher concentration, requiring energy in the form of ATP.
Intestinal Lumen
The hollow part of the intestine through which digested food and secretions move.
Ions
Atoms or molecules that carry a net electric charge due to the loss or gain of one or more electrons.
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