A union for sets means you combine the two sets together. The symbol of a union is ∪, so we can represent this question with K <span>∪ L.
You simply must combine the two sets together without repeating any of the same numbers.
K </span><span>∪ L = {2, 3, 5, 7, 8}.</span>
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There are 3 tens in one because 10 plus 10 plus 10 is 30.