Problems $21\mathrm{.}8\mathrm{.}4.$

Write the following numbers in magnitude$-$phase form

a$)$ tilde$(z)=-i$

b$)$ tilde$(z)=3\mathrm{.}5$

c$)$ tilde$(z)=e$

d$)$ tilde$(z)=4+3i$

e$)$ tilde$(z)=\frac{}{2}+1i$

f$)$ tilde$(z)=-1-i$