text: # Prealgebra: Variables
  
  ## Contents
  
  #### Problems
  
  Problem : What is r + 5 if r = 7 ? If r = - 11 ?
  
  12, - 6
  
  Problem : What is 2k if k = 15 ? If k = 100 ?
  
  30, 200
  
  Problem : What is r 2 if r = 15 ? If r = 2/3 ?
  
  225, 4/9
  
  Problem : What is 15f - 12 if f = 1 ? If f = 3 ?
  
  3, 33
  
  Problem : What is 4×(m - 6) + 34 if m = 12 ? If m = 0 ?
  
  58, 10
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