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Math Help - Grade 7 Mathematics, an equation for a pattern

  1. #1
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    Grade 7 Mathematics, an equation for a pattern

    I'm new so I'm not sure, but this seems the best place for this.

    How would I write an algebraic equation for when in a pattern, the blocks double each time?

    Example of an equation:
    If the pattern was:
    Term 1, 7 blocks
    Term 2, 8 bl
    ocks
    Term 3, 9 blocks

    Then the equation would be (n+6), with n being the term number.

    In my case, the pattern is as follows. (Exact quote)
    "Use each description to create an algebraic expression for the pattern rule."
    "The number of blocks doubles each time."
    I conclude from this that the pattern will be:
    Term 1, 1 block
    Term 2, 2 blocks
    Term 3, 4 blocks
    Term 4, 8 blocks
    Term 5, 16 blocks


    So, what equation would I use to go about calculating the number of blocks in the 50th term?

    About the bold text, when I typed this it became bold, and I can't seem to get rid of the effect. So I decided a fully bold post would still be kind of pretty.

    Edit: 2^(n-1) seems to be correct, so this can be locked, or whatever.
    Last edited by Kreyni; May 25th 2012 at 04:46 PM.
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  2. #2
    MHF Contributor
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    Ottawa, Canada
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    Re: Grade 7 Mathematics, an equation for a pattern

    Quote Originally Posted by Kreyni View Post
    Edit: 2^(n-1) seems to be correct, so this can be locked, or whatever.
    Correct.
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