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• which definition describes a half-life? the time required for half of a radioactive sample to decay. the time required for half of a radioactive sample to become unstable. the time required for all of a radioactive sample to change because of heat. the time required for all of a sample to break down due to pressure change.
  
• during an independent emergency ascent, you should stop periodically and attempt to inhale through your regulator because:
  
• read the excerpt from grendel. thus i fled, ridiculous hairy creature torn apart by poetry—crawling, whimpering, streaming tears, across the world like a two-headed beast, like mixed-up lamb and kid at the tail of a baffled, indifferent ewe—and i gnashed my teeth and clutched the sides of my head as if to heal the split, but i couldn’t. how is grendel characterized in this excerpt? as humorous and comical as violent and dangerous as upset and confused as weak and sickly
  
• read the passage about what happened in pompeii after mount vesuvius erupted. there was found a skeleton with a bronze axe, having attempted to break through the wall next to him. it is not unreasonable to suppose that he was . . . unable to flee by means of the courtyard, where the volcanic debris was too abundant, had attempted to make his way through the opposite wall. –françois de paule latapie why is the passage an example of a secondary source? the author is describing a firsthand account of the ruins of pompeii. the author is providing commentary on his discovery in the ruins of pompeii. the author is explaining what he experienced during the eruption of mount vesuvius. the author is presenting evidence about the damage caused by the eruption of mount vesuvius.
  
• which quotations support the central idea that brutus thinks it will do no harm and may actually benefit the conspirators if they let antony give the eulogy at caesar’s funeral? select two options.
  
• but it is the opinion of no less than the country's no. 2 official, premier wen jiabao. in remarkable public comments last summer, wen said chinese officials ""must continue to liberate their thinking and make bold explorations"" in reform. without ""reform of the political system,"" he argued, ""it will be impossible for the goal of economic reform and modernization to be realized."" china must reverse ""the excessive concentration of unrestrained power"" and ""create conditions for the people to criticize and supervise the government. . . . people's democratic rights and legitimate rights must be guaranteed"" for economic growth to continue. to support his argument, the author includes quotations by a chinese corporate leader. a chinese newspaper reporter. a prominent chinese government official. the head of china’s government.
  
• which expression can be used to find the difference of the polynomials? (4m – 5) – (6m – 7 + 2n)
  
• read this passage from president reagan’s speech to holocaust survivors to identify an appeal. we must see to it that the immeasurable pain of the holocaust is not dehumanized, that it is not examined clinically and dispassionately, that its significance is not lost on this generation or any future generation. though it is now a dry scar, we cannot let the bleeding wound be forgotten. only when it is personalized will it be real enough to play a role in the decisions we make. those victims who cannot be with us today do a vital service to mankind by being remembered. but we must be their vessel of remembrance. this reunion is part of our duty to them. –speech to holocaust survivors, ronald reagan which type of appeal does reagan use in this passage? which pair of words or phrases from the passage best indicates the type of appeal used?
  
• the rule is applied to δbcd to produce δb""c""d"". point b"" of the final image is at (–4, 1). what are the coordinates of point b on the pre-image? (–2, –5) (0, –5) (2, 3) (5, 0)
  
• a box sits on a table. a short arrow labeled f subscript n = 12 n points up. a short arrow labeled f subscript g = 12 n points down. a long arrow labeled f subscript p = 15 n points right. a short arrow labeled f subscript f = 3 n points left. a man pushes on the box from the left. what is the force of friction acting on this box? n what is the net force acting on this box? n to the