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

s

Question

Asked 5/23/2014 10:12:47 PM

Updated 5/26/2014 1:32:34 PM

1 Answer/Comment

Rating

8

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

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]

Find the slope of the line that contains the following points.
(-6,-24),(-4,-17),(-2,-10)(4,11)

Question

Updated 5/21/2014 7:17:15 PM

1 Answer/Comment

What is the equation of the line with a slope of -1/3 that goes through the point ( 5, 3)?
**Weegy:** y=3x+8 is the equation of the line with slope 3 that contains point (-1,5). (More)

Question

Updated 5/21/2014 7:12:01 PM

1 Answer/Comment

what is the 7th term of this geometric sequence? 5,15,45,135

Question

Updated 5/24/2014 12:41:17 PM

1 Answer/Comment

What is the ratio for the following geometric sequence?
2, 0.5, 0.125, .03125

Question

Updated 5/24/2014 5:22:45 PM

1 Answer/Comment

The ratio for the geometric sequence 2, 0.5, 0.125, .03125 is 1/4. 2 * 1/4 = 0.5; 0.5 * 1/4 = 0.125; 0.125 * 1/4 = 0.03125

Added 5/24/2014 5:22:45 PM

This answer has been confirmed as correct and helpful.

34,841,094

questions answered

There are no comments.