Answer
$\Delta V=0.432cm^3$
Work Step by Step
We know that;
$\Delta V=V\beta \Delta T$
As $\beta=3\alpha$,
$\Delta V=3\alpha V\Delta T$
We plug in the known values to obtain:
$\Delta V=125\times 3(23\times 10^{-6})(50)=0.432cm^3$
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