Select all representations for the domain of a function given by time passed since your last meal.

Question

(0, ∞)
(0, ∞)

(−∞, ∞)
(−∞, ∞)

{x| x>0}
{x| x>0}

{x| x≥0}
{x| x≥0}

[0, ∞)
[0, ∞)

{x| x∈R}

Answer 1

{x| x∈R}