Math

Tell whether each sequence is arithmetic. Justify your answer. If the sequence is arithmetic, write a function rule to represent it.
15. 128, 64, 32, 16...
16. 3, 3.25, 3.5, 3.75..

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asked by Macie
  1. check the differences:
    #15: -64,-32,-16,...
    #16: 0.25,0.25,0.25,...

    Looks like #16 is

    Tn = 2.75 + 0.25n

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    posted by Steve

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