(-1$\dfrac{2}{7}$) + (-3$\dfrac{5}{7}$) + (6$\dfrac{4}{7}$) is -------------
$\dfrac{3}{7}$
$\dfrac{5}{7}$
$\dfrac{11}{7}$
$\dfrac{19}{7}$
Explanation:
=$(-\dfrac{9}{7})+(-\dfrac{26}{7})+\dfrac{46}{7}$
=$\dfrac{46}{7}-\dfrac{35}{7}$
=$\dfrac{11}{7}$
=$(-\dfrac{9}{7})+(-\dfrac{26}{7})+\dfrac{46}{7}$
=$\dfrac{46}{7}-\dfrac{35}{7}$
=$\dfrac{11}{7}$