[tex] { (- 2.5) }^{ - 2 } = (- \frac{25}{ 100} )^{ - 2} = ( - \frac{4}{1}) ^{2} = \frac{16}{1} = 16[/tex]
[tex](0.(3))^{ - 4} = (\frac{3}{9} ) ^{ - 4} = {3}^{4} = 81[/tex]
[tex]( - 0.1(6)) ^{ - 3} = ( - \frac{16 - 1}{90} ) - ^{ - 3} = ( \frac{90}{15} ) ^{4} = {6}^{4} = 1728[/tex]
