Evaluate the double integral. 
, 
is triangular region with vertices 
.
Definitions:
Materials Price Variance
The difference between the actual cost of direct materials and the expected (standard) cost multiplied by the actual quantity purchased or used.
Labour Rate Variance
The difference between the actual cost of labor and the expected (or standard) cost.
Flexible Budget
A budget that adjusts or flexes with changes in the volume or activity level of a business.
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