Problem $4(20$ pts$)$: Trusses: Method of joints $-$ Practice. For the truss below:

$($i$)$ Calculate its determinacy $(2$ pts$)$

$($ii$)$ Generate the FBD $(3$ pts$)$

$($iii$)$ Solve for its reactions $(3$ pts $)$ and perform one validation $(3$ pts $)$

$($iv$)$ Find the forces in all its members using the Method of joints $(9$ pts $).$

Note: do not forget to declare the sign convention and reference line you are

using, along with all the units for the quantities you derive.