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15 September, 15:39

Find the 11th term of this sequence - 10, 20, - 40

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Answers (2)
  1. 15 September, 18:29
    0
    -10,240.

    Step-by-step explanation:

    This is a geometric sequence with common ratio 20/-10 = - 40/20 = - 2.

    The nth term = a1r^ (n-1) where a1 = the first term and r = the common ratio, so the 11th term = - 10 * (-2) ^ (11-1)

    = - 10 * 1024

    = - 10,240.
  2. 15 September, 18:59
    0
    Step-by-step explanation:

    the nth term of the geometric sequence is : An = A1 * r^ (n-1)

    A1 = - 10

    r = - 40/20=20/-10=-2

    n = 11

    A11 = - 10 * (-2) ^ (11-1)

    A11 = - 10 * (-2) ^ (10)

    A11 = - 10240
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