The level of a lake was 8 inches below normal. It decreased 1 and 1/4 inches in June and 2 and 3/8 inches more in July. What was
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The plane has intercepts at (1, 0, 0), (0, 2, 0), and (0, 0, 6), so we can parameterize the surface 
by
where
and 
. Now
so the surface integral reduces to
where
so the surface integral reduces to
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