a cardboard figure has the shape shown in figure 8.58. the region is bounded on the left by the line x=a, on the right by the line x=b, above by f(x), and below by g(x). if the density d(X) gm/cm^2 varies only with x, find an expression for the total mass of the figure in terms of f(x), g(x), and d(x)

(i did not provide the shape because it is not necessary in the completion of this problem)

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