Density and mass Suppose a thin rectangular plate, represented by a region R in the xy-plane, has a density given by the function ρ(x, y); this function gives the area density in units such as grams per square centimeter (g/cm2). The mass of the plate is
a. ρ(x, y) = 1 + sin x
b. ρ(x, y) = 1 + sin y
c. ρ(x, y) = 1 + sin x sin y
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