Question: Can't scale x,y,z axis the way I want

I am trying to plot a 3d curve using the "plot3d" command.  When I type in this command along with a function and x,y bountries (x=-5..5,y=-5..5) the x and y axis do not range from -5 to 5.  How do you fix this?  Also, is it possible for the z axis to be scaled?

Thanks

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