$5-9$ to $5-17.$ Determine the $P_n$ and $\frac{P_n}{{}_c}$ for each of the columns, using the AISC Specification

and $F_y=50$ksi, unless noted otherwise.

$5-9$

a$.$ W$1258$ with $L_c=KL=18ft.($Ans$.445$ k LRFD; $296$ k ASD$)$

d$.$ HP$1042$ with $L_c=KL=15ft.($Ans$.371$ k LRFD; $247$ k ASD$)$

e$.$ WT$844\mathrm{.}5$ with $L_c=KL=20ft.($Ans$.260$ k LRFD; $173$ k ASD$)$