Which is an equivalent expression for {(5/7)²· (1/3)⁻³}⁻¹ ?
(5/7)² .(1/3)⁻³
(5/7). (1/3)⁻⁴
(7/5)⁻² . (1/3)⁻³
(7/5)² .(1/3)³
