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anonymous

  • one year ago

Shanna writes the formula f(x + 1) = 2.5f(x) when f(1) = 2 to represent this sequence: 2, 5, 12.5, 31.25, … Which error did Shanna make?

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  1. anonymous
    • one year ago
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    A) She used the incorrect common ratio. B) She used the incorrect initial value. C) She should have multiplied by f(x) rather then have it as an exponent. D) She treated the sequence as geometric instead of arithmetic.

  2. Owlcoffee
    • one year ago
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    Well, you'll have to determine the common ratio the same way, divide the second by the first, and if it does not give 2,5 as a result, she used the wrong common ratio.

  3. anonymous
    • one year ago
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    what do you think @shaylaLuv ?

  4. anonymous
    • one year ago
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    B.

  5. anonymous
    • one year ago
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    I think shanna did nothing wrong

  6. anonymous
    • one year ago
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    \(f(x + 1) = 2.5f(x)\), \(f(1) = 2\), let \(x=1\)\[f(2)=2.5f(1)=2.5 \times 2=5\]and let \(x=2\)\[f(3)=2.5f(2)=2.5 \times5=12.5\]let \(x=3\)\[f(4)=2.5f(3)=2.5 \times 12.5=31.25\]

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