Question:
Tick (✓) the correct answer
$\left(\frac{-5}{3}\right)^{-1}=?$
(a) $\frac{5}{3}$
(b) $\frac{3}{5}$
(c) $\frac{-3}{5}$
(d) none of these
Solution:
(C) $\frac{-3}{5}$
$\left(\frac{-5}{3}\right)^{-1}=\left(\frac{3}{-5}\right)^{1}=\frac{3}{-5}=\frac{3 \times(-1)}{-5 \times(-1)}=\frac{-3}{5}$