Chapter 3 - Solving Inequalities - 3-3 Solving Inequalities Using Multiplication or Division - Practice and Problem-Solving Exercises - Page 182: 34

3, 5, 6, 9

We need to get the variable alone. In order to cancel out division, we use multiplication, so we multiply both sides of the inequality by 3. Thus, we obtain that $r \geq -12$. Furthermore, four solutions to the inequality are 3, 5, 6, and 9.