The Southeast region of the United States of America.
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It would be the sum of the areas of each surface separately.
Wihout more of a description, a broad range would be 100-1000 USD
Africa - in particular the Western Sarhara
A PET scan would be most useful for detecting brain areas that are most active as a person performs mathematical calculations.
I would have to say areas of equal pressure. I am not sure :(