Appendix A - Equations and Inequalities - Page 421: 85

The answer is $3 \leq x \leq 6$ The equivalent interval notation is $[3, 6]$.

$10 \leq 2x + 4 \leq 16$ $10 - 4 \leq 2x \leq 16 - 4$ $\frac{6}{2} \leq x \leq \frac{12}{2}$ $3 \leq x \leq 6$ The equivalent interval notation is $[3, 6]$.