1. $\frac { 5 } { 4 } \div \frac { 7 } { 16 }$ 

   Hint (a):

   When you divide by a fraction, you are also multiplying by its reciprocal.

   More Help (a):

   $\frac{5}{4} \cdot \frac{16}{7}$

   Answer (a):

   $\frac{20}{7}$

2. $- \frac { 10 } { 13 } \cdot \frac { 5 } { 11 }$ 

   Hint (b):

   The answer will be negative.

3. $\frac { 9 } { 11 } \div ( - \frac { 20 } { 21 } )$ 

   Hint (c):

   See (a).

   More Help (c):

   $\frac{9}{11} \cdot \left(-\frac{21}{20}\right)$

d $- \frac { 8 } { 3 } \div ( - \frac { 5 } { 18 } )$