Chapter 1, Equations and Graphs - Section 1.8 - Solving Absolute Value Equations and Inequalities - 1.8 Exercises - Page 153: 57

(a) $|x-0.020|\leq 0.003$ (b) $0.017\leq x\leq 0.023$

(a) If $x$ is the thickness of the laminate, then: $|x-0.020|\leq 0.003$ Since $0.003$ represents the "error" or tolerance from the goal of $0.020$. (b) $|x-0.020|\leq 0.003$ $-0.003\leq x-0.020\leq 0.003$ $ 0.017\leq x\leq 0.023$