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6 December, 10:01

The value of the 4th term is 80. the sequence is being doubled each step what is the 7th term?

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  1. 6 December, 11:53
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    This is a geometric sequence with common ratio (r) = 2.

    an = ar^ (n - 1)

    a4 = a (2) ^ (4 - 1) = a (2) ^3 = 8a

    8a = 80

    a = 80/8 = 10

    7th term (a7) = 10 (2) ^ (7 - 1) = 10 (2^6) = 10 (64) = 640
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