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10 April, 16:13

The recursive formula for an arithmetic sequence is an = an - 1 + d.

If the common difference is - 11 and a4 = 6, what if the value of a5?

A) - 5

B) 5

C) 17

D) - 17

+3
Answers (2)
  1. 10 April, 16:20
    0
    A) - 5 should be your answer
  2. 10 April, 16:39
    0
    If an is a5

    and

    an-1 is a4

    then using your recursive formula for an arithmetic sequence

    an=an-1 + d

    then

    a5=a4+d

    now, a4 = 6 and common difference "d" is d=-11

    hence

    a5=6 - 11

    6-11 = - 5

    any questions?
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