I do not understand set-builder notation.....

Question

Using correct mathematical notation and symbols, express the following in set-builder notation: Z = {16, 17, 18, 19, 20}

Answer 1

Assistance needed.

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Answer 2

-4 (3y + 13) < -16y - 28

Answer 3

Use set builder notation to represent the following set.

{... -3, -2, -1, 0}