Question

give me the answer of all these questions in the step by step explanation please it's urgent ​

Answer 1

refer the attachment:

Answer 2

$reciprocal \: of \: {12}^{5} = \frac{1}{ {12}^{5} }$

$reciprocal \: of \: {( - 9)}^{4} = \frac{1}{ {9}^{4} }$

$reciprocal \: of \: {( \frac{2}{7} )}^{3} = { \frac{(7}{3}) }^{3}$