Which of the following statements regarding the opportunity cost of producing potatoes and the production possibilities frontier is true for the island of Atlantis? a. The island of Atlantis has an decreasing opportunity cost of producing potatoes and the production possibility frontier is bowed outward. b. The island of Atlantis has an increasing opportunity cost of producing potatoes and the production possibility frontier is bowed inward. c. The island of Atlantis has a constant opportunity cost of producing potatoes and the production possibility frontier is linear. d. The island of Atlantis has an increasing opportunity cost of producing potatoes and the production possibility frontier is bowed outward.

The market for corn in country a is highly competitive. at the current market price of $5/bushel there is a shortage of 100,000 bushels of corn in this country. media reports claim that the price of corn will rise drastically in the near future. according to these reports, the neighboring country b had witnessed a similar situation recently. at the same price, the shortage in country b was also 100,000 bushels and eventually the equilibrium price in b went up to $10/bushel. both countries are known to have equal number of corn producers and the market supply of corn is identical at all prices. this, combined with the fact that consumers in the two countries also have similar tastes and preferences, led the media to conclude that the price of corn in country a would soon be as high as $10/bushel. the new equilibrium price turns out to be below $10/bushel, what inferences can be drawn?

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Environmentalists are concerned about emissions of sulfur dioxide into the air. the average number of days per year in which sulfur dioxide levels exceed 150 milligrams per cubic meter in milan, italy, is 29. the number of days per year in which emission limits are exceeded is normally distributed with a standard deviation of 4.0 days. what percentage of the years would exceed 37 days?