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31 October, 23:03

Translate the following into interval notation: "The union of all numbers greater than eight, and less than or equal to negative four".

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  1. 1 November, 02:34
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    () is for

    [] is for ≤≥

    greater than 8 means

    x>8 or

    8 to infinity not counting 8 or

    (8,∞)

    less than or equal to - 4 is

    x≤-4 or

    from - ∞ to - 4

    or

    (-∞,-4]

    the infinity has a () sign since you cannot equal infinity, you can approach it

    U is unity so

    (-∞,-4] U (8,∞)
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