Question: ( a ) Find an equation for a standard cone with vertex ( 0 , 0 , 8 ) opening down. ( b ) Find

(a) Find an equation for a standard cone with vertex (0,0,8) opening down.
(b) Find an equation for the upper hemisphere centered at the origin with radius 6.
(c) Find an equation of a plane that is parallel to the yz-plane and passes through the point (-9,2,11).

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