Which of the following rational numbers is negative?
(a) \(-\dfrac{3}{7}\)
(b) \(\dfrac{-5}{-8}\)
(c) \(\dfrac{9}{8}\)
(d) \(\dfrac{3}{-7}\)
\(\dfrac{3}{-7} = -\dfrac{3}{7}\), which is negative. Others are positive.