[tex]{(( \frac{1}{2} ) ^{ - 3} + {( \frac{5}{2} )}^{2 } + {( \frac{4}{7}) }^{ - 1} ) ^{(2)} }^{ - 1} \\ {(8 + \frac{25}{4} + \frac{7}{4} ) }^{ \frac{1}{2} } \\ {(8 + \frac{32}{4} )}^{ \frac{1}{2} } = {(8 + 8)}^{ \frac{1}{2} } = {16}^{ \frac{1}{2} } \\ \sqrt{16} = 4[/tex]
