algebrall

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Which is an arithmetic sequence?



A. 1, 4, 9, 16, . . .

B. 2, 1, –1, –4, . . .

C. 4, 8, 16, 32, . . .

D. 21, 9, –3, –15, . . .

.
help please

  • algebrall -

    an arithmetic sequence has a constant difference between terms. Looking at the differences, we see:

    A. 3,5,7, . . .
    B. -1,-2,-3, . . .
    C. 4,8,16, . . .
    D. -12,-12,-12, . . .

    I guess the answer is D, eh?

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