Consider the truss in Figure P$4,$ which is supported by a pin at A and roller at G$.$ It spans $18m$ between joints A and $G.$ It is loaded with five vertical forces along the bottom chord joints. The load values are $P=19kN$ and $Q=10kN.$ The reaction forces at the supports are $A_x=0,A_y=38\mathrm{.}5kN,$ and $G_y=29\mathrm{.}5kN,$ with the directions shown in the figure. The angles are $=53\mathrm{.}1301$ and $=69\mathrm{.}4440.$

Figure P$4.$ Truss loaded with various point forces.

a$)$ Determine the force in member JI$$JE and DE$.$ Use a positive value to indicate tension and a negative value to indicate compression. Provide your answer in $kN$ to $4$ decimal places. $[2$ marks$]$