Answer
New length $= 3.8388 m$
Work Step by Step
We know the new length of the Uranium fuel rod is equal to the subtraction between the previous length, and the decrease in length.
So, we can write =$\gt$ New length $= 3.846 m - 7.2 mm$
To solve this equation we have to convert unit millimeters into meters. So let's convert it first,
$7.2 mm= 7.2\times10^{-3}m = 0.0072 m$
