6. (5 pоints) A prоtective phоne cаse is molded to fit а new smаrtphone model. Case internal length: 150.00 ± 0.20 mm Smartphone overall length: 149.60 ± 0.10 mm Using worst‑case linear addition of tolerances, what range of fore‑and‑aft “wiggle room” (axial clearance) could the phone experience inside the case?