Using Fubini’s Theorem, argue that the solid in Figure 18 has volume AL, where A is the area of the front face of the solid.

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THEOREM 3 Fubini's Theorem The double integral of a continuous function f(x, y) over a rectangle R = [a,b] x [c, d] is equal to the iterated integral (in either order): b. ff F(x, y)dA= -1L == F(x, y) dy dx = x=a y=c f(x,y) dx dy