$5-7(60$ points$)$ Determine the LRFD design strength for the

compression member shown. Use $F_y=50$ksi

$($a$)$ Use equations of AISC Specification E$3$

$($b$)$ Use AISC Manual design Table $4-1$a

$($c$)$ Use AISC Manual design Table $4-14$

$($Answer $435$ kips$)$