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16 April, 17:03

Find the sum of the first 12 terms of the arithmetic series 32+27+22 + ...

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Answers (2)
  1. 16 April, 17:12
    0
    54

    Step-by-step explanation:

    The first twelve terms would be, in decreasing order, 32, 27, 22, 17, 12, 7,2, - 3, - 8,-13,-18,-23.

    1. - 23+22 = - 1

    2. - 13+12 = - 1

    3. - 18+17 = - 1

    4. - 8+7 = - 1

    5. - 3+2 = - 1

    Using these five facts, we can simplify this to 32+27 - 5 (1) = 32+27-5 = 54
  2. 16 April, 18:45
    0
    Answer:77

    32+27+22+17+12+7+2-3-8-13-15-18=77
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