select all representations for the domain of a function given by the number of hours slept in one day

Answer 1

- 0.5, 1, 1.5, 2, 2.5, ...
- 0, 1, 2, 3, 4, ...
- [0, ∞)
- {x ∈ ℝ | x ≥ 0}
- {x | x is a non-negative real number}
- (0, ∞)