a) $\frac{3}{10}+(\frac{-5}{12})=\frac{-7}{60} $
b) $(\frac{-3}{8})-(-\frac{7}{24})=-\frac{1}{12}$
c) $(\frac{-5}{14})+0.25=\frac{-3}{28}$
d) $(-\frac{7}{8})-1.25=\frac{-17}{8}$
e) $(\frac{-5}{14})\times\frac{21}{25}=\frac{-3}{10}$
f) $\frac{8}{27}/(-\frac{16}{45})=\frac{-5}{6};$
g) $(1\frac{5}{6})/(4\frac{1}{8})=\frac{4}{9}$
h) $0.38\times(\frac{-7}{19})=\frac{-7}{50}$
i) $(\frac{-4}{5})\times(\frac{15}{-8})\times1\frac{1}{9}=\frac{5}{3}$