$\"\"$

\

The interval is $\"\"$ .

\

(a)

\

The inequality of interval $\"\"$ is $\"\"$ .

\

$\"\"$

\

(b)

\

The interval is $\"\"$ .

\

The interval $\"\"$ is bounded.

\

$\"\"$

\

(a) The inequality of interval $\"\"$ is $\"\"$ .

\

(b) The interval $\"\"$ is bounded.