Answer
$2.8\times 10^{-7}~inches$
Work Step by Step
$7.0~nm\times \frac{10^{-9}~m}{1~nm}\times \frac{3.28~feet}{1~m}\times \frac{12~in}{1~foot}$
$= 275.52\times 10^{-9}~inches = 2.8\times 10^{-7}~inches$
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