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7. Find the volume of the solid region enclosed by the surface p = 12 cos p. 288 m 71 12 CO56 B. 2447/3 C. 3207 /3 rsing ar de do D. 284T E. 3187/3 ( 12 cos 9 ) sing $ 9 du = 's - 14 4 5 - 8. Calculate the mass of the tetrahedron with corners (0, 0, 0), (1, 0, 0), (0, 2, 0), and (0, 0, 4) whose mass density is p(x, y, z) = 2z. 2 - X A. 12 4 4 Noo B 2 z dx/ jf dyd' A D D. WIHNIH COI 2 - X , E ISS 22 X 4 - X - Y 4 x + 2 4 +2 = 4 4- 4 Z = 4- 4X- 24 2 4 - 4- 4x 16 5