mathmetics math/intervals

i am doin homework and i do not know what an interval is

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  1. An interval is to indicate a range of values on the number line.
    For example, if we want to say:
    0≤x≤10, we would say that
    x is on the interval [0,10], where 0 and 10 are the limits of the interval, and [] stand for the ≥ and ≤ signs respectively.
    If the limit is excluded from the interval, such as 0≤x<π
    we write:
    [0,π)
    Same goes for
    -∞<x<∞, or (-∞∞).

    All this sound abstract, the best is to post a relevant question, which demonstrates the context of what you are doing in your course.

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  2. Enter the interval [-4,oo)

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