A={ -1; 2; 3; 5; 7; 11} B={0; 5; 7; 15} C = {-1; 0; 3; 5; 12} Determine: a) B U A b) (C ∩ A) U B c) (C – A) ∩ B d) B ∩ (C U A) e) C – (B U A) *
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Resposta:
George Washington was not only the President we look to when it comes to defining the office; he is why two terms was standard until FDR broke the mold with four elected terms. He is why we refer to the person in the office as "Mr. President." He also knew how to relax after a hard day’s work. Just before the Constitution was signed, he invited fifty or so of the people that worked on the document with him to celebrate the completion of this monumental task. They celebrated one impressive feat with another: they consumed “fifty four bottles of Madeira, sixty bottles of claret, twenty two bottles of porter, eight bottles of whiskey, eight bottles of hard cider, twelve bottles of beer, and seven bowls of punch”. What is not recorded is the hangover cure the next day.
Alcohol, in all of its varieties, has been a part of American history from the time that the Pilgrims stopped in Massachusetts because they ran out of beer. The holder of the highest office in the land is not immune to the allure of a cocktail or four a day. Some of them, like George W. Bush and Ruthford B. Hayes (his wife was known as “Lemonade Lucy” for her ban on drinking in the White House), abstained completely from drinking. Other presidents drank a little more than was healthy. A few even used the White House and its gardens to make their own drinks; Barak Obama’s staff uses honey harvested on site to brew several varieties of beer, and Teddy Roosevelt used mint grown on the property to make Mint Juleps for his guests.
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