17. Graphing Complex Numbers

Express the complex number $z=2-4i$ in the polar form.

Express the complex number $z=7+11i$ in polar form.

Express the complex number $z=1-\frac{\sqrt3}{3}i$ in polar form.

Convert the complex number $z=12\left(\cos90\degree+i・\sin90\degree\right)$ from polar to rectangular form.