1 Answer

ImClarky · Answer 1 · 2023-01-11T15:22:19+0000

Part 1

$D \cup E$ denotes the union of the two sets (in other words, all the elements in both sets).

This means it is
$(-\infty, 4) \cup [7, \infty)$

Part 2

$D \cap E$ denotes the elements shared between both sets.

This means the answer is
(4, 7]

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