18-20. The solid D is bounded below by the xy-plane z = 0, above by the surface z² = x² + y² and on the side by the surface x² + y² = 16. # 18. Find the volume by using cylindrical coordinates with dV = r dr do dz. # 19. Find the volume by using cylindrical coordinates with dV = r dz dr do. # 20. Find the volume by using spherical coordinates.

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