Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 36: 74

Point R

$\sqrt 9$=3 and $\sqrt 4$=2. $\sqrt 8$ is between $\sqrt 9$ and $\sqrt 4$, so the value for $\sqrt 8$ should be between 2 and 3. Thus, the best approximation is point R, which is the only point on the line between 2 and 3.