89.95 $\leq$ x $\leq$ 90.05 cm
Work Step by Step
Ideal length is 90, length varies by 0.5 ,so add 0.5 to 90 and subtract 0.5 from 90: 90+.05=90.05 90−.05=89.95 Thus; 89.95 $\leq$ x $\leq$ 90.05 cm
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