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17 May, 05:06

Find the 84th term of the arithmetic sequence - 27,-12,3

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Answers (2)
  1. 17 May, 08:42
    0
    The answer will be 1218.
  2. 17 May, 08:48
    0
    Aritmetic has a common difference

    -27 to - 12 is a difference of 15

    -12 to 3 is a difference of 15

    an=a1+d (n-1)

    a1=first term

    d=common difference

    fist term is - 27

    common difference is 15

    an=-27+15 (n-1)

    84th term is n=84

    a84=-27+15 (84-1)

    a84=-27+15 (83)

    a84=-27+1245

    a84=1218

    the 84th term is 1218
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