The rational number $\dfrac{32}{-40}$ expressed in standard form is

1. $\dfrac{8}{-10}$

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

3. $\dfrac{-32}{40}$

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

What should be added to $\dfrac{-3}{16}$ to get $\dfrac{5}{8}$ ?

1. $\dfrac{2}{8}$

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

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

4. $\dfrac{13}{16}$

The sum of $-\dfrac{1}{3}$ and its multiplicative inverse is

1. 0

2. -3

3. $-1\dfrac{2}{3}$

4. $-3\dfrac{1}{3}$

The product of $-\dfrac{1}{3}$ and its additive inverse is

1. 0

2. -3

3. $-\dfrac{1}{9}$

4. $-3\dfrac{1}{3}$