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5 July, 10:28

What is the 6th term in this geometric sequence? 5, - 15, 45, - 135

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  1. 5 July, 10:34
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    -1215.

    Step-by-step explanation:

    For a geometric sequence:

    nth term = a1 r^ (n-1)

    The first term a1 = 5 and the common ratio r = - 15/5 = - 3.

    So 6th term = 5 * (-3) ^ (6-1)

    = 5 * (-3) ^5

    = - 1215.
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