Q: If the sixth term of a sequence is 128 and the common ratio is 2, then what is the first term?

A: The answer is 4.
Solution:
4 x 2 x 2 x 2 x 2 x 2 = 128

Expert answered|Shey091808|Points 465|

Question

Asked 10/2/2012 8:19:16 AM

Updated 1/25/2015 5:52:54 PM

2 Answers/Comments

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3

The next term of the following sequence: 9, 6, 4, ... is 8/3 .

common ratio = 6/9 = 4/6 = 2/3

next term = 4*2/3 = 8/3

common ratio = 6/9 = 4/6 = 2/3

next term = 4*2/3 = 8/3

Added 1/20/2015 12:23:41 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [1/25/2015 11:06:58 PM]

3

The common ratio for the following sequence 27, 9, 3, 1, ... is 1/3 .

common ratio = 9/27 = 3/9 = 1/3

common ratio = 9/27 = 3/9 = 1/3

Added 1/25/2015 5:52:54 PM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [1/25/2015 11:07:22 PM]

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