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Express the integral / / / f(x, y, z)dV as an iterated integral E in six different ways, where E is the solid bounded by Z = 0, x = 0, z = y - 7x and y = 21. ph2(z,y) 1 . f(x, y, z) dzdydx a g1 (a ) Jhi (x,y) a 0 b = 91 (2 ) = 92 (ac ) = hi(x , y ) = h2(x, y ) = 92 (y) ph2(2,y) 2 . f(x, y, z) dzdxdy a gi ( y ) Jhi (x,y) a 0 b = g1 (y) = 92 ( y) = hi(x, y) = h2(x, y) = 92 (2) ph2(y,z) 3. f(x, y, z) dxdydz a g1 (2 ) Jhi(y, z) a = 0 b = 91 ( z) = 92 ( z ) = hi(y, z) = h2 (y, z) = b g . (y ) ,h. (y, z) 4 . f(x, y, z) dadzdy 191 (y ) Jhi(y, z ) a = 0 b = g1(y) = 92 ( y) = hi(y, z) = h2 (y, z ) = 92(ac) ph2(ac, z ) 5 . f(x, y, z) dydzdx g1 (a ) Jhi(2, z) a = 0 = 91 ( 20 ) = 92 ( 20 ) hi ( x , z) = h 2 ( 20 , 2 ) = 92 (z) ph2(ac, z) 6. f(x, y, z) dydadz a 91 (z ) Jh (x, z ) a 0 = 91 ( z ) = 92 ( 2) = hi (x, z) = h2(ac, z) =