Introduction to imaginary numbers

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Simplify the roots of negative numbers

$\blacksquare\;$ $■$ $\sqrt{-16}$ $- 16$
$\blacksquare\;$ $■$ $\sqrt{-40}$ $- 40$
$\blacksquare\;$ $■$ $(-9)^{\frac{3}{2}}$ $(- 9)^{\frac{3}{2}}$
Simplify the following imaginary numbers with high powers

$\blacksquare\;$ $■$ $i^5$ $i^{5}$
$\blacksquare\;$ $■$ $i^{200}$ $i^{200}$
$\blacksquare\;$ $■$ $(\frac{3i}{2})^4$ $(\frac{3 i}{2})^{4}$