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Determine whether each sequence is arithmetic or geometric. Find the next three terms.
1.
14, 19, 24, 29, . . . (1 point)

geometric, 34, 39, 44
arithmetic, 32, 36, 41
arithmetic, 34, 39, 44 ***
The sequence is neither geometric nor arithmetic.

2.
–4, 8, –16, 32, . . . (1 point)

arithmetic, 64, 128, 256
geometric, –64, 128, –256 ***
geometric, –48, 64, –80
The sequence is neither geometric nor arithmetic.

3.
81, 27, 9, 3, . . . (1 point)

arithmetic, 0, –3, –6
geometric, 0, –3, –6
geometric, 1, one-third, one-ninth***
The sequence is neither geometric nor arithmetic.

4. What are the first four terms of an arithmetic sequence if the common difference is 1.5 and the first term is 15? (1 point)

a. 15, 30, 45, 60
b. 15, 16.5, 18, 19.5***
c. 15, 22.5, 33.75, 50.625
d. none of the above

5. What are the first four terms of a geometric sequence if the common ratio is 10 and the first term is 4.5? (1 point)

a. 4.5, .45, .045, .0045
b. 4.5, 9.0, 13.5, 18.0
c. 4.5, 14.5, 24.5, 34.5
d. none of the above

i dunno if #5 is a. or d.
pls help asap!!!!!
thanx in advance

  • Ms. Sue? Steve? Reiny? Damon? anyone pls? -

    sorry to be sooooo impatient

  • math -

    #1-4 all ok
    #5. What's the trouble? Start with 4.5 and start multiplying by 10's. (D) since you get
    4.5 45 450 4500 ...

    (a) is common ratio of 0.1

  • math -

    ok, i wasn't sure, for a second i thought it was a.
    thanks Steve!:)

  • math -

    All correct except 5

    #5 is d

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