Using mesh analysis & determinants, find the following for the circuit above. Show all calculations. Show direction of each current. $(5$ points each$)$

a$)IR1$

b$)$ IR$2$

c$)$ IR$3$

Using nodal analysis, find the voltage at $N_2(V_1)$ for the circuit in Figure $8\mathrm{.}8.$ Show all calculations. $(5$ points$)$