ok ok
I did the first two. See what you can do on these, ok?
Find the mass and center of mass of the lamina that occupies the region D and has the given density function ρ.
D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y)
m=?
(x,y)=?
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