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If the fifth and sixth terms of a geometric sequence are 8 and 16, respectively, then what is the first term? A. B. C. D.
If the fifth and sixth terms of a geometric sequence are 8 and 16, respectively, then the first term is 1/2. 16 = 8 • r^(2-1) r = 2 16 = a1 • 2^(6-1) a1 = 16/32 a1 = 1/2
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Asked 5/23/2014 10:12:47 PM
Updated 5/26/2014 1:32:34 PM
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If the fifth and sixth terms of a geometric sequence are 8 and 16, respectively, then the first term is 1/2.

16 = 8 • r^(2-1)

r = 2

16 = a1 • 2^(6-1)

a1 = 16/32

a1 = 1/2
Added 5/26/2014 1:32:34 PM
This answer has been confirmed as correct and helpful.
Confirmed by yumdrea [5/26/2014 1:49:03 PM]
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