Evaluate the double integral 
for the given function f(x, y) and the region R.
f(x, y) = 2y + 3x; R is the rectangle defined by 
Definitions:
Monopoly
A market structure where a single firm controls the entire supply of a good or service, leading to significant market power over price and quantity.
Profit Maximization
The process or strategy aimed at achieving the highest possible profit, where total revenue exceeds total costs.
Rock Climbing Shoe
Specialized footwear designed to provide climbers with enhanced grip and support on vertical or near-vertical rock surfaces.
Monopoly
A market structure characterized by a single seller, selling a unique product in the market with no close substitutes.
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