We reviewed the evaluation of nth roots of a complex number w where n>1 ie solving z^n = w. We recalled that the solutions (roots) all sit on a circle whose radius is the nth root of |w|. Where exactly they sit on that circle is determined by the argument (angle) of w - let's call it phi. We know that phi + 2\pi k (where k runs from 1 to n) also give us w. Then, by de Moivre's theorem, the exact locations of the roots z_k are given by dividing this by n ie by 1/n(phi + 2\pi k) for k = 1,....,n. 
We began our final topic on systems of linear equations with applications. We demonstrated the process of Gaussian Elimination via a worked example.