Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

i) \(\frac{2}{5}+\frac{7}{3}+\frac{-4}{5}+\frac{-1}{3}\)

ii) \(\frac{3}{7}+\frac{-4}{9}+\frac{-11}{7}+\frac{7}{9}\)

iii) \(\frac{2}{5}+\frac{8}{3}+\frac{-11}{15}+\frac{4}{5}+\frac{-2}{3}\)