College Algebra 7th Edition

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