1. The problem statement, all variables and given/known data Compute the 4th roots of -16 in both Cartesian and polar form and plot their positions in the complex plane. 2. Relevant equations z^1/n=(r^1/n)(e^i(theta)/n), (r^1/n)(e^i(theta)/n)(e^i2(pi)/n........ 3. The attempt at a solution How do I find the value of r, and theta??