The product of two numbers is $\dfrac{-16}{35}$. If one of the numbers is $\dfrac{-15}{14}$, then the other is

1. $\dfrac{-2}{5}$

2. $\dfrac{-8}{3}$

3. $\dfrac{8}{15}$

4. $\dfrac{32}{75}$

Which of the following numbers is in standard form?

1. $\dfrac{-12}{26}$

2. $\dfrac{-49}{70}$

3. $\dfrac{-9}{16}$

4. $\dfrac{28}{-105}$

$\left(\dfrac{-5}{9} \div \dfrac{2}{3}\right)$ = ?

1. $\dfrac{-5}{2}$

2. $\dfrac{-5}{6}$

3. $\dfrac{-10}{27}$

4. $\dfrac{-6}{5}$

$\dfrac{4}{9} \div\ ? = \dfrac{-8}{15}$

1. $\dfrac{-32}{45}$

2. $\dfrac{-8}{5}$

3. $\dfrac{-9}{10}$

4. $\dfrac{-5}{6}$