Confused... The question is:
Identify the 13th term of the geometric sequence 10, 8, 6.4

My work:
10(.8)^12 = .6871947674

Doesn't match possible answers? o.O

Question

Confused... The question is:
Identify the 13th term of the geometric sequence 10, 8, 6.4

My work:
10(.8)^12 = .6871947674

Doesn't match possible answers? o.O

anonymous · Answer

Possible answers:

anonymous · Answer

@nphuongsun93 This has me stumped..

anonymous · Answer

My class has not once gone over this.

anonymous · Answer

give me a bit, been a while since i do this

anonymous · Answer

^lol

anonymous · Answer

guess it's D, it's nearest to 0.69

anonymous · Answer

Alright, thanks.

Got to say, this e-school just sucks.

anonymous · Answer

@nphuongsun93 

I just found this answer + work online. What do you think?

a(1) = 52
 r = 39/52 = 29.25/39 = 3/4 = 0.75
 a(n) = a(1) * r^(n - 1)
 a(15) = 52 * 0.75^(15 - 1)
 a(15) = 52 * 0.75^14
 a(15) =~ 0.92653329670429229736328125

anonymous · Answer

yea it looks right o-o