Question

help fast! Find the 5th term of the geometric sequence 9, 27, 81,…

Answer 1

GS terms are a, ar, ar^2 ...

a = first term, r = common ratio

Answer 2

use the formula

\[T_{n} = ar^{n -1}\]

a = 9 and r = 3 n = 5

Answer 3

i tried, what would the fifth term be?

Answer 4

9 * 3^4

Answer 5

\[T_{5} = 9\times3^{5 -1}\]

so

\[T_{5} = 9 \times 3^4\]

here is a calculator you can use

http://web2.0calc.com/

Answer 6

9* 3^4 can u just do that? trust me i know how to tho

Answer 7

well its 9 x 3 x 3 x 3 x 3= 9 x 81

Answer 8

81x9?

Answer 9

yep that 9 x 80 + 9 x 1 =

Answer 10

279??

Answer 11

is that my answer?

Answer 12

close... swap the first 2 digits

Answer 13

729 oops!

Answer 14

thats the answer