$(25$ points$)$: In an attempt to simplify manufacture of their fully$-$welded steel structures,

a company would like to use standard lengths and cross$-$sections. One member size under

consideration would be $48$ in long, with a hollow rectangular section $,$

$($:$w=2$inA$=0\mathrm{.}6875i{n}^2,I_z=0\mathrm{.}1051i{n}^4,I_y=0\mathrm{.}3317i{n}^4$