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• was used as an indicator because it is colorless in solutions and pink in solutions.
  
• 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.
  
• with respect to family life, how does post-industrial north american society differ from societies of other periods?
  
• which job might be held by someone in a mid-level caste? doctor housekeeper farmer priest
  
• what information would verify that lmno is an isosceles trapezoid? check all that apply. ln ≅ mo lm ≅ on lo ≅ mn ∠l ≅ ∠n ∠l ≅ ∠m
  
• what is the least common denominator of the equation startfraction 2 over 9 endfraction x + two-thirds x = 7? 3 9 27 63
  
• how do the images help the reader understand how to perform the final steps of the procedure? select two options. the image shows where to hold the filter case when removing it. the image shows what size and type of filter should be purchased. the image shows the difference between a clean filter and dirty one. the image shows what type of car the instructions are intended for. the image shows that it is helpful to wear gloves when removing the filter.
  
• over the past 20 years, the efforts of the united states have decreased the amount of pollutants in the environment.
  
• the area, a, of an ellipse can be determined using the formula a = πxy, where x and y are half the lengths of the largest and smallest diameters of the ellipse. which is an equivalent equation solved for y? y = a · πx y = a + (πx) y = a – πx y = a ÷ (πx)
  
• choose the equation that relates the balances in the accounts y years after martin opened his account. c = m(1.05)4y m = c(1.05)4y c = 1.22m m = 1.22c