Write a triple integral in cylindrical coordinates of the function f(x, y) = x+y over the region bounded by the xy-plane, z = 20 - 3x² - 3y2, and z= x² + y².

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Q: termine the solid bounded by the surfaces 9x2+4y2=30 and the plane 9x+4y−6z=0 in the first octan

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A: Evaluation of triple integrals using cylindrical coordinates