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• one of the scientists in the video compared ice cores to rings on a tree. when you look at a cross section of a tree trunk, you can see rings in it. these rings indicate the annual growth cycle of the tree. counting them reveals how many years the tree was alive. what did the scientist mean when he said that ice cores are like tree rings?
  
• president roosevelt called december 7, 1941, “a date which will live in infamy.” which of these definitions is the best meaning of the word “infamy”? celebration dishonor fame honor
  
• the principle difference between point source and nonpoint source water pollution is _______. a. whether the pollution is organic or inorganic b. the number of sources of pollution c. the amount of pollution d. whether it is from commercial or agricultural sources
  
• where does mrs. morningstar say william works? the grocery store the post office the white house
  
• the fbi uses str (short tandem repeat) analysis to identify criminals, and the fbi stores the information in a database. how many regions, or loci, of dna are used for str analysis? 5 13 26 30
  
• if the congress maintains these principles, the voters, putting patriotism ahead of pocketbooks, will give you their applause. –four freedoms, franklin d. roosevelt what type of appeal does roosevelt use in this section of the speech? what effect does roosevelt hope to have on congress with this appeal? what effect does roosevelt hope to have on american citizens with this appeal?
  
• which values of x and y would make the following expression represent a real number? (6 + 3i)(x + yi) x = 6, y = 0 x = –3, y = 0 x = 6, y = –3 x = 0, y = –3
  
• consider this reaction: which statement is most likely true about hbr? it turns blue litmus red. it reacts with carbon dioxide to form a carbonate. it feels slippery.
  
• if the frequency of a radio station is 88.1 mhz (8.81 × 107 hz), what is the wavelength of the wave used by this radio station for its broadcast? the answer should have three significant figures.
  
• expand: in 2a3 b4 ln 2 + 3 ln a - 4 ln b ln 2 - 3 ln a - 4 ln b ln 2 - 3 ln a + 4 ln b