Sandy plans to paint one wall in her bedroom. The wall is 9 feet high and 12 feet long. There is a 2-foot by 4-foot area on that
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The volume is given by the triple integral
which evaluates to
where the coefficient 4 comes from integrating with respect to
, and the integrand 
comes from integrating with respect to 
.
which evaluates to
where the coefficient 4 comes from integrating with respect to