Mathematics: Rational Numbers, Integers, and Set Notation

All rational numbers are integers.

Integers are a subset of rational numbers. (correct)

All integers are rational numbers.

Rational numbers are a subset of integers.

{x ∈ ℤ | -5 < x < -1}

{x ∈ ℕ | x ≥ 21}

{x ∈ ℤ | x = 7 or x = 10} (correct)

{x ∈ ℝ | x = 7 or x = 10}

12.53

12.54

12.5 (correct)

12.6

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