Find the complement of the set given that

U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}.
(Use the roster method to write the set. Enter EMPTY or ∅ for the empty set.)
{composite numbers}

The complement of the set of composite numbers in the given set U can be found by listing all the elements in U that are not composite numbers.

The set of composite numbers in U is {4, 6, 8, 9}. Finding the complement means listing all the elements in U that are not in the set of composite numbers.

The complement of the set of composite numbers in U is {0, 1, 2, 3, 5, 7}.

So, the complement of the set of composite numbers in U is {0, 1, 2, 3, 5, 7}.