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24 November, 20:43

Find the sum of the arithmetic sequence.

-1, 2, 5, 8, 11, 14, 17

+2
Answers (2)
  1. 24 November, 21:06
    0
    If your just adding and finding the sum it would be 58

    Step-by-step explanation:

    1+2+5=8

    8+8=16

    16+11=27

    27+14=41

    41+17=58
  2. 24 November, 21:07
    0
    S₇ = 16

    Step-by-step explanation:

    First term = - 1

    common difference d = 3; n = 7

    The sum of first n terms Sₙ = 2 a + (n - 1) d

    S₇ = 2 * - 1 + (7 - 1) 3

    = - 2 + (6 * 3)

    = - 2 + 18

    = 16
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