Appendix A - Review - A.10 Internal Notation; Solving Inequalities - A.10 Assess Your Understanding - Page A87: 32

$ 1\lt x \lt 2$ See the figure below.

The given interval uses parentheses on both ends so its equivalent inequality notation would involve $\lt$ on both ends. Thus, the given interval can be written as $ 1\lt x \lt 2$. To graph, plot circles at $ x=1$ and $x=2$, then shade the region in between. See the figure below.