Attention: For questions 53-60, read the text below and decide which answer (A, B, C or D) best fits each gap.
Saving energy: it starts at home We already know the fastest, 53 expensive way to slow climate change: use less energy. With a little effort, and not 54
money, most of us could reduce our energy diets by 25 percent or more − 55 the Earth a favor while also helping our pocketbooks.
So what's holding us back? Scientists have reported recently that the world is heating up even faster KK 56 predicted only a few years KK 57 , and that the
consequences could be severe if we don't KK 58 reducing emission of carbon dioxide and other greenhouse gases that are trapping heat in our atmosphere. But what can we KK 59 about it as individuals? Will our efforts really KK
60 any difference?
(Extracted from the National Geographic Magazine, March 2009)
Attention: For questions 53-60, read the text below and decide which answer (A, B, C or D) best fits each gap. Saving energy: it starts at home We already know the fastest, 53 expensive way to slow climate change: use less energy. With a little effort, and not 54 money, most of us could reduce our energy diets by 25 percent or more − 55 the Earth a favor while also helping our pocketbooks. So what’s holding us back? Scientists have reported recently that the world is heating up even faster KK 56 predicted only a few years KK 57 , and that the consequences could be severe if we don’t KK 58 reducing emission of carbon dioxide and other greenhouse gases that are trapping heat in our atmosphere. But what can we KK 59 about it as individuals? Will our efforts really KK 60 any difference? (Extracted from the National Geographic Magazine, March 2009)
Uma reação em que há transformação do dióxido de carbono em monóxido de carbono é representada pela equação:
Pelo princípio de Le Chatelier,
Um imóvel vale hoje R$ 240.000,00 e estima-se que daqui a 4 anos valerá R$ 320.000,00. Admitindo-se que o valor desse imóvel seja regido por uma função do 1º grau, está correto afirmar que daqui a 6 anos esse imóvel valerá
Considere em 
dois pontos coincidentes. O valor de 
e igual a Y,
