Match the surface to its contour plot. 
Definitions:
Emissions Standard
Legal limit on the amount of pollutants that a firm can emit.
Marginal External Cost
The additional cost incurred by society due to one more unit of a good or service being produced, that is not accounted for by the producer.
External Cost
A cost of a transaction that affects someone who is not directly involved in the transaction.
Profit Maximizing
A strategy or point at which a firm decides the price and output level that leads to the maximum profit.
Q11: Evaluate the triple integral. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB2342/.jpg" alt="Evaluate
Q11: Identify the surface. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB2342/.jpg" alt="Identify the
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Q71: Which of the following is the contour
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