Arrange the following quantities in ascending order.(The level curves of $z = f ( x , y )$ are shown in the figure.Assume that the scales on the x- and y-axes are the same.) $f _ { y } ( P ) , f _ { y } ( Q ) , f _ { x } ( R ) , - f _ { x } ( S )$

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The Answer of Arrange the following quantities in ascending order.(The level curves of $z = f ( x , y )$ are shown in the figure.Assume that the scales on the x- and y-axes are the same.) $f _ { y } ( P ) , f _ { y } ( Q ) , f _ { x } ( R ) , - f _ { x } ( S )$

Arrange the Following Quantities in Ascending Order z=f(x,y)z = f ( x , y )z=f(x,y)

Arrange the Following Quantities in Ascending Order $z = f ( x , y )$