Several intervals can be combined into one region using the "set union" operation, ∪∪, which is represented as "u" in webwork. for example, [-2,0] u (8,inf) represents the points from −2−2 to 00 together with everything bigger than 8.

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Question:

Several intervals can be combined into one region using the "set union" operation, ∪∪, which is represented as "u" in webwork. for example, [-2,0] u (8,inf) represents the points from −2−2 to 00 together with everything bigger than 8.

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Write the set of points from  -6 to 0 but excluding  -4  and 0 as a union of intervalsFirst we take  the interval  -6 to 0. In that -4  and 0 are excluded.So we split the interval -6 to 0.Start with -6 and go up to -4. -4 is excluded so we break at -4. Also we use parenthesis for -4.Interval becomes [-6,-4) . It says -6 included but -4 excluded.Next interval starts at -4 and ends at 0. -4 and 0 are excluded so we use parenthesis not square brackets(-4,0)Now we take union of both intervals[-6,-4) U (-4,0)  --- Interval from  -6 to 0 but excluding  -4  and 0

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