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a guest May 16th, 2018 98 Never
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  1. An = A1 + (n-1)r
  2.  
  3. a) a4 = a2 + 2r
  4.    2 + 2r = 6
  5.    r = 2
  6.    a1 = 2 - 2
  7.    a1 = 0
  8.    An = 0 + (n - 1)2
  9. b) a5 = a2 + 3r
  10.    9 = 0 + 3
  11.    r = 3
  12.    a1 = 0 - 3
  13.    a1 = -3
  14.    An = -3 + (n - 1)3
  15. c) a10 = a4 + 6r
  16.    -10 = 2 + 6r
  17.    r = -2
  18.    a1 = a4 - 3r
  19.    a1 = 8
  20.    An = 8 (n - 1)-2
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