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Math Help - Sequences

  1. #1
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    Sequences

    Write the nth term of the following sequence in terms of the first term of the sequence.
    1, 8, 15, 22, . . .


    Write the nth term of the following sequence in terms of the first term of the sequence.
    10, 20, 40, . . .


    Write the nth term of the following sequence in terms of the first term of the sequence.
    2, -4, 8, -16, . . .
    Last edited by mr fantastic; August 9th 2010 at 12:27 AM. Reason: Re-titled.
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  2. #2
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    Quote Originally Posted by pletchera View Post
    Write the nth term of the following sequence in terms of the first term of the sequence.
    1, 8, 15, 22, . . .
    1 + 7(n - 1)

    Write the nth term of the following sequence in terms of the first term of the sequence.
    10, 20, 40, . . .
    10 * 2^(n - 1)

    Write the nth term of the following sequence in terms of the first term of the sequence.
    2, -4, 8, -16, . . .
    2 * (-2)^(n - 1)
    .
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  3. #3
    Member grgrsanjay's Avatar
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    1.1+7(n-1)
    2. 10[2^{n - 1}]
    3. 2[{-2}^{n - 1}]
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  4. #4
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    Quote Originally Posted by grgrsanjay View Post
    1.1+7(n-1)
    2. 10[2^{n - 1}]
    3. 2[{-2}^{n - 1}]
    Aren't those same as mine?
    Except your #3 is wrong: the -2 should be bracketed.
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