Question

What should be added to $\frac{-5}{7}\text{to get}\frac{-2}{3}$?

(a) $\frac{-29}{21}$

(b) $\frac{29}{21}$

(c) $\frac{1}{21}$

(d) $\frac{-1}{21}$

Answer 1

$\frac{-2}{3}-\left(\frac{-5}{7}\right)=\frac{-2}{3}+\frac{5}{7}=\frac{-14+15}{21}=\frac{1}{21}$