a)
[tex] {( \frac{8}{11} )}^{2} = \frac{ {8}^{2} }{ {11}^{2} } = \frac{64}{121} [/tex]
b)
[tex] {( \frac{3}{4} )}^{3} = \frac{ {3}^{3} }{ {4}^{3} } = \frac{27}{64} [/tex]
c)
[tex] {( - \frac{2}{3}) }^{4} = \frac{ {2}^{4} }{ {3}^{4} } = \frac{16}{81} [/tex]
