algebra

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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 -

    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 -

    Thank you Reiny and it was a typo....thanks..

  • algebra -

    shes right both are correct just got a 100

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