Find the mass and center of mass of the lamina that occupies the region D and has the given density function ρ. D is bounded by y = √x, y = 0, and x = 1; ρ(x, y) = 13x Find the mass and center of mass of the lamina that occupies the region D and has the given density function ρ. (Enter your answer as an improper fraction.) D = {(x, y) | 0 ≤ y ≤ sin (π x/L), 0 ≤ x ≤ L}; ρ(x, y) = 9y