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• read and choose the correct verb in the imperfect tense to complete the sentence. él ________ al guía turístico.
  
• select the correct answer from each drop-down menu. hemoglobin level age less than 25 years 25–35 years above 35 years total less than 9 21 32 76 129 between 9 and 11 49 52 46 147 above 11 69 44 40 153 total 139 128 162 429 based on the data in the two-way table, the probability of being 25-35 years old given a hemoglobin level above 11 is . the probability of being 25-35 years old is . being 25-35 years old and having a hemoglobin level above 11 dependent on each other.
  
• the product of two consecutive integers is 420. which quadratic equation can be used to find x, the lesser number? x2 + 1 = 420 x2 + 2 = 420 x2 + x = 420 x2 + 2x = 420
  
• triangle xyz is a right triangle with the right angle at vertex y. angle x must be . angle z must be . the sum of angles x and z must be 90°.
  
• sean just bought new headphones for $50. later that day, sean sees a friend who said they got the same headphones for $30. sean assumes that these cheaper headphones must be knockoffs. which logical fallacy is sean suffering from in this example?
  
• which example best illustrates that light behaves like particles? light bends as it strikes a window. light bounces off a white cement sidewalk. light travels in space at a speed of about 3.0 x 108 m/s. light increases in speed as it moves through matter.
  
• eva's mother describes eva as a mildly active child. she also feels that eva's mood is marginally negative. according to chess and thomas' classification, which of the following characteristics is eva most likely to demonstrate?
  
• molly is planting the flowers using the proportional relationship of 18 pink flowers to 12 white flowers per row. find the ratio of pink flowers per white flower per row. molly is planting a ratio of pink to white flowers.
  
• iodine-131 has a half-life of 8 days. how long would it take for the number of unstable nuclei in the sample to be reduced from 1,000 to 125?
  
• a photon has 8.0 × 10–15 j of energy. planck’s constant is 6.63 × 10–34 j•s. what is the frequency of the photon?