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8 May, 18:59

What is the common difference in the sequence 9, 4, - 1, - 6?

A. 5

B. - 5

C. 9

D. - 11

(Am I dividing or subtracting?)

+5
Answers (1)
  1. 8 May, 21:41
    0
    Use first differences. You are subtracting. Difference = Subtracting.

    9 - x = 4

    4 - x = - 1

    -1 - x = - 6

    Find for x.

    9 - x = 4

    - x = 5

    x = - 5

    Therefore the answer is B.

    Proof:

    9 - 5 = 4

    4 - 5 = - 1

    -1 - 5 = - 6
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