The Level Surfaces of the Functions $$g _ { 1 } ( x , y , z )$$

question 45

Essay

The level surfaces of the functions $$g _ { 1 } ( x , y , z )$$ $$g _ { 2 } ( x , y , z )$$ and $$g _ { 3 } ( x , y , z )$$ are shown in below respectively. Which function is is decreasing in the positive z-direction?

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