Posted by **Cassie** on Tuesday, March 19, 2013 at 10:41am.

Determine whether each sequence is arithmetic or geometric. Find the next three terms.

4, 8, –16, 32, . . .

A.arithmetic, 64, 128, 256

B.geometric, –64, 128, –256

C.geometric, –48, 64, –80

.DThe sequence is neither geometric nor arithmetic.

I think it's B...?

81, 27, 9, 3, . . .

A.arithmetic, 0, –3, –6

B.geometic, 0, –3, –6

C.geometric, 1,1/3 , 1/9

D.The sequence is neither geometric nor arithmetic.

I know they are dividing by 3...but I am not sure if this is A or D...?

- algebra -
**Reiny**, Tuesday, March 19, 2013 at 11:40am
If for your given terms, the first term is -4

then it would be geometric.

Probably just a typo, if so

then r = -2 , and your choice of B would be correct

for the second, it is geometric , and yes, they are dividing by 3, so r = 1/3

let's keep going

81 27 9 3 1 1/3 1/9

so it is C

- algebra -
**Cassie**, Tuesday, March 19, 2013 at 11:48am
Thank you Reiny and it was a typo....thanks..

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