$2)$ Draw the influence lines for the reaction force at $\backslash ($ A $\backslash ),$ the shear force at $\backslash ($ C $\backslash )$ and the moment at C$.($Show Values$)$

$3)$ The Beam of problem $\backslash$#$2$ is subjected to uniform dead load $\backslash (2\backslash$mathrm$\{$lb$\}/\backslash$mathrm$\{$ft$\}\backslash )$ and uniform live load of $\backslash (80\backslash$mathrm$\{$lb$\}/\backslash$mathrm$\{$ft$\}\backslash )$ and a single live concentrated force of $5001$ lb $.$ Determine $($a$)$ the maximum reaction force at $\backslash ($ A $\backslash ),($b$)$ the maximum positive shear at point $\backslash ($ C $\backslash ),$ and $($c$)$ the maximum positive moment at point $\backslash ($ C $\backslash ).$