Name the property involved in the following example

$\frac{5}{2}\times \frac{3}{7}=\frac{15}{14}$

Find the multiplicative inverse i.e. the reciprocal of

$\frac{11}{-5}$

$\frac{18}{49}-\frac{2}{7}=\frac{2}{7}-\frac{18}{49}$

Find the multiplicative inverse i.e. the reciprocal of

$\frac{11}{20}$

Find the multiplicative inverse i.e. the reciprocal of

$\frac{-7}{-8}$

Every non-zero number has its more than one multiplicative inverse.

Find the multiplicative inverse i.e. the reciprocal of

$\frac{-19}{16}$

Find the multiplicative inverse i.e. the reciprocal of

$-23$

Write the reciprocal of the following with a positive exponent.