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Part A $-$ Moment of Inertia of a Composite Beam about the $x$ axis

For the built$-$up beam shown below, calculate the moment of inertia about the $x$ axis.

$($Figure $7)$

The dimensions are $d_1=7\mathrm{.}0in,d_2=13\mathrm{.}0in,d_3=7\mathrm{.}5in,$ and $t=0\mathrm{.}80in.$

Express your answer to three significant figures and include the appropriate units.

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