adding parallel Impedance 1
To divide by a complex number, use the conjugate of the denominator. like so:

$$
\begin{align}
{100\over (12 - 16j)} &amp; = {100\over (12 - 16j)} {(12 + 16j)\over (12 + 16j)} \\
\\
&amp; = {(1200 + 1600j)\over (144 + 256)} \\
\\
&amp; = {(1200 + 1600j)\over 400} \\
\\
&amp; = {(3 + 4j)\over 1} \\
\\
\end{align}
$$