$$(iii)(\frac{2}{3})^{-3}\times(\frac{9}{4})^{-2}\times(99)^{0}$$
$-\frac{2}{3}i\approx -0.666666667i$
$$-i\times \left(\frac{2}{3}\right)^{-3}\times \left(\frac{9}{4}\right)^{-2}\times 99^{0}$$
$$-i\times \frac{27}{8}\times \left(\frac{9}{4}\right)^{-2}\times 99^{0}$$
$$-\frac{27}{8}i\times \left(\frac{9}{4}\right)^{-2}\times 99^{0}$$
$$-\frac{27}{8}i\times \frac{16}{81}\times 99^{0}$$
$$-\frac{2}{3}i\times 99^{0}$$
$$-\frac{2}{3}i$$
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$0$
$$Re(-i\times \left(\frac{2}{3}\right)^{-3}\times \left(\frac{9}{4}\right)^{-2}\times 99^{0})$$
$$Re(-i\times \frac{27}{8}\times \left(\frac{9}{4}\right)^{-2}\times 99^{0})$$
$$Re(-\frac{27}{8}i\times \left(\frac{9}{4}\right)^{-2}\times 99^{0})$$
$$Re(-\frac{27}{8}i\times \frac{16}{81}\times 99^{0})$$
$$Re(-\frac{2}{3}i\times 99^{0})$$
$$Re(-\frac{2}{3}i)$$
$$0$$
