Question

Determine whether each sequence is arithmetic or geometric. Find the next three terms.
81, 27, 9, 3, ...
A. arithmetic, 0, -3, -6
B. geometric, 0, -3, -6
C. geometric, 1, 1/3, 1/9
D. The sequence is neither geometric nor arithmetic.

Answer 1

@Freeboy15

Answer 2

see
to be an arithmetics series it must satisfy
3 - 9 = 9 - 27 = 27 - 81 bt thts not true
bt if u see then
3/9 = 9/27 = 27/81 ...

Answer 3

What??

Answer 4

do u know whts arithmetic series is and what geometric one is ???

Answer 5

no omg .-.

Answer 6

Can you see any pattern in the numbers? How might you get from 81 -> 27 and then from 27 -> 9?

Answer 7

@MellamoKatie http://www.mathsisfun.com/algebra/sequences-sums-geometric.html

https://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html

Answer 8

As a hint:
In a "geometric sequence" the pattern is either MULTIPLICATION or DIVISION.
In a "arithmetic sequence" the pattern is either ADDITION or SUBTRACTION.

Answer 9

Omg can I not get hinds and links and just the answer??

Answer 10

nope sorry

Answer 11

Wow cool I've been on the same question for like 8 hours thanks so much for the help

Answer 12

@jim_thompson5910

Answer 13

Oh okay

Answer 14

divide any term by its previous term

if you get the same result each time, then you have a geometric sequence

Answer 15

you'll also use the idea

next term = (common ratio)*(previous term)

Answer 16

wait so I divide 9 by 27?

Answer 17

yes I already showed that in the second drawing

Answer 18

So .3333....

Answer 19

or 1/3

Answer 20

Oh okay so C?

Answer 21

yes

Answer 22

Thanks so much!