In the United States, between 2007 and 2012, carbon dioxide emissions fell by 12 percent, primarily because of
a. fewer highway miles driven by cars and trucks.
b. expanded use of ethanol as the result of regulations imposed by the Environmental Protection Agency.
c. an increase in the supply and lower prices of natural gas, leading to substitution of this cleaner fuel for coal in the generation of electricity.
d. milder weather in the nation during the period, which reduced the energy demanded, and fuel used for heating and cooling.
C
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Four candidates are running for president of their book club, which has a total of 36 members. The table below indicates the number of voters and their preferences
Determine the winner under the plurality-rule method, the Borda-count method (assigning 3 points to each first choice, 2 points to each second choice, 1 point to each third choice, and no points to each fourth choice), and the instant runoff method. Number of voters and their preferences 7 14 6 9 1st Choice Amy Byron Coco Dinesh 2nd Choice Coco Dinesh Amy Amy 3rd Choice Byron Amy Dinesh Coco 4th Choice Dinesh Coco Byron Byron
Insurance policies can be bought to cover unexpected costs due to which kind of risk?
A. Automobile theft B. Fire damage to your home C. Fighting a rare disease D. Individuals can buy insurance to cover all these risks.
This graph shows the cost and revenue curves faced by a monopoly. 
According to the graph shown, if Q2 units are being produced, this monopolist:
A. is earning negative economic profits. B. is earning zero economic profits. C. may be earning zero accounting profits. D. is earning positive economic profits.
The introduction of a tariff will be expected to
A. reduce imports. B. increase the prices of exports but have no effect on the level of imports. C. reduce the prices of exports but have no effect on the level of imports. D. increase exports.