Discussion
The interval \( (b, +\infty) = \{\, x \mid x > b \,\} \) is classified as
Answer: C
The parenthesis at \( b \) excludes that endpoint, so the interval is open; it extends to \( +\infty \) with no upper endpoint, so it is unbounded.
\[ (b, +\infty) = \{\, x \mid x > b \,\} \]
Hence open and unbounded. Infinity is never an included endpoint, so that side always carries a parenthesis.
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