For question #$1,$ the beam description should be

A steel wide$-$flange section that is $18$ in $.$ deep is used as a simple

beam. If the moment of inertia of the section is $1160in.{?}^4$ and the

allowable unit stress in the extreme fibers of the beam at the section

of maximum bending moment is $24,000$ psi for either tension or

compression