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anonymous

  • one year ago

I have no clue what to do? The first four terms of a sequence are shown below: 7, 4, 1, -2 Which of the following functions best defines this sequence?

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  1. anonymous
    • one year ago
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    This is an arithmetic sequence because every term is 3 less than the one before it. The formula for any term of an arithmetic sequence is \[a_n=a_1+d(n-1)\] a1 is the first term (7) and d is -3 because the pattern is subtracting 3

  2. anonymous
    • one year ago
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    Plug in for a1 and d, then simplify

  3. anonymous
    • one year ago
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    but were did you get -3 from? and what about 4, 1 , and -2

  4. Plasmataco
    • one year ago
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    4-3=1, 1-3=-2

  5. anonymous
    • one year ago
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    |dw:1434762668634:dw|

  6. Plasmataco
    • one year ago
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    yup.

  7. anonymous
    • one year ago
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    oh okk thankyou

  8. Plasmataco
    • one year ago
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    no problem

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