a. $$ 12.7\ cm$$ b. $$127 \ mm.$$
Work Step by Step
Since $1 in= 2.54 cm$ and $1 cm =10\ mm$, then we have a. $$5\ in=5 \times 2.54 \ cm =12.7\ cm$$ b. $$5\ in=5 \times 2.54 \times 10 \ mm=127 \ mm.$$
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