An Airport Is Located Next to a Housing Development

question 7

Multiple Choice

An airport is located next to a housing development. Where X is the number of planes that land per day and Y is the number of houses in the housing development, profits of the airport are 22X - X² and profits of the developer are 20Y - Y² - XY. Let H₁ be the number of houses built if a single profit-maximizing company owns the airport and the housing development. Let H₂ be the number of houses built if the airport and the housing development are operated independently and the airport has to pay the developer the total "damages" XY done by the planes to the developer's profits.

• A) H₁ = 10 and H₂ = 6.
• B) H₁ = 8 and H₂ = 9.
• C) H₁ = 6 and H₂ = 10.
• D) H₁ = H₂ = 6.
• E) H₁ = 9 and H₂ = 13.

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Aerobic Exercise

Sustained activity—jogging, swimming, or cycling, for example—that stimulates heart and lung functioning.

Anaerobic Exercise

Physical exercise intense enough to cause lactate formation, conducted in short bursts where oxygen demand surpasses oxygen supply.

Moderate Physical Activity

Any form of exercise or movement of the body that uses energy at a moderate level, not too light and not too intense.