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4 February, 04:36

Which best describes the relationship between the successive terms in the sequence shown?

9, - 1, - 11, - 21, ...

The common difference is - 10.

The common difference is 10.

The common ratio is - 9.

The common ratio is 9.

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Answers (1)
  1. 4 February, 08:04
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    9, - 1, - 11, - 21, ...

    -10 - 10 - 10

    a (n) = a₁ + d (n - 1)

    a (n) = 9 - 10 (n - 1)

    a (n) = 9 - 10 (n) + 10 (1)

    a (n) = 9 - 10n + 10

    a (n) = - 10n + 9 + 10

    a (n) = - 10n + 19

    The common difference is - 10.
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