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vera_ewing

  • one year ago

Check my answer please

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  1. anonymous
    • one year ago
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    Don't think so. The common ratio is -2.

  2. welshfella
    • one year ago
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    none of them are correct common ratio = -10 according to the question.

  3. anonymous
    • one year ago
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    Common ratio is any term divided by the term immediately preceding it.\[\frac{ -10 }{ 5 } = -2\]

  4. welshfella
    • one year ago
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    oh sorry I misread the question The second term is -10.!!!

  5. welshfella
    • one year ago
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    as ospreytriple has said the common ratio r can be found by second term / first term = -10 / 5

  6. anonymous
    • one year ago
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    In general,\[a_n = a_1\left( r \right)^{n-1}\]For the first term (n=1) you would get\[a_1=a_1\left( r \right)^{1-1} = a_1\]In your question, \(a_1 = 5\) and \(r = -2\)

  7. welshfella
    • one year ago
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    hint: first term is when n = 1

  8. anonymous
    • one year ago
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    Well, if you think the answer is B, try n=0 and see what you get.

  9. anonymous
    • one year ago
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    Correct.

  10. welshfella
    • one year ago
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    its A

  11. vera_ewing
    • one year ago
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    Thank you

  12. anonymous
    • one year ago
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    You're welcome

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