Discussion
The interval \( [a, +\infty) = \{\, x \mid x \geq a \,\} \) is
Answer: D
Read the two features separately.
The square bracket at \( a \) means the endpoint is included (\( x \geq a \)), so the interval is closed at that end. It extends to \( +\infty \) with no upper endpoint, so it is unbounded.
Hence it is closed and unbounded. Infinity is never itself included, which is why that side is always written with a parenthesis.
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