Graphing and solving a one step compound inequality - math help

The video tutorial explains how to solve compound inequalities by either separating them into two inequalities or solving them as one. It demonstrates solving the inequality -6 < b - 4 < 2 by isolating the variable b, adding 4 to all parts of the inequality, and graphing the solution on a number line. The tutorial emphasizes the importance of using open circles for inequalities that are strictly less than or greater than, rather than less than or equal to.

How do you represent the solution of the inequality in interval notation?

What is the significance of using open circles when graphing inequalities?