FEA process using spring elements

A spring system is shown here:

Part $1$: For this specific system, develop the:

a$.$Global stiffness matrix

$-$b$.$ Boundary condition vector

c$.$ Load vector

d$.$ Reduced system of equations

e$.$ Reaction force equations $($ie$,$ the equations eliminated by the boundary conditions$)$

Part $2$: Given: $k1=70\frac{N}{m}m,k2=110\frac{N}{m}m,k3=165\frac{N}{m}m,F1=150N,F2=100N,$ and nodes $1$ and $3$ are fixed; calculate the:

a$.$ Global stiffness matrix

b$.$ Displacements of nodes $2$ and $4$

c$.$Reaction forces at nodes $1$ and $3$

d$.$Spring force in each of the springs