Mathematics: The nth term of a geometric sequence is a sub n =a sub 1 times r ^n-1 , where a sub 1 is the first term and r is the common ratio. Identify a sub 1 and r for each geometric sequence.

The nth term of a geometric sequence is a sub n =a - id7163655, michellemonroe012305

Mads7218

30.01.2022

Answer/Step-by-step explanation:

Common ratio of a sequence can be gotten by dividing any of the consecutive term in a sequence, by the term before it.

Thus,

For the sequence, 3, 9, 27. . . : a_1 = 3

$r = \frac{9}{3} = 3$

For the sequence, 8, 4, 2, 1. . . : a_1 = 8

$r = \frac{4}{8} = \frac{1}{2}$

For the sequence, -16, 64, -256 . . : a_1 = -16

$r = \frac{64}{-16} = -4$

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