The supply and demand for 9-volt batteries are given by QD = 230 - 10P and QS = 30P - 10, where P is the price per four-pack and Q measures the number of four-packs. 
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A nonpartisan American think tank based in Washington, D.C., that provides information on social issues, public opinion, and demographic trends shaping the United States and the world.
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The involvement or participation in political activities, aiming to influence political decisions or support certain policies or candidates.
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The practice of consuming alcoholic beverages in a manner that avoids adverse effects on health, social life, and legal standing.
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