Which interval describes the set of **non-negative real numbers**?
A$(0, \infty)$
B$[0, \infty)$
C$(-\infty, 0)$
D$(-\infty, \infty)$
Answer & Solution
Correct answer: B. $[0, \infty)$
*Non-negative* = $\ge 0$, which **includes** $0$. So the interval is closed at $0$: $[0, \infty)$.
- **A** excludes $0$ — those are *positive*, not *non-negative*.
- **C** is the negative reals.
- **D** is all of $\mathbb{R}$.
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