Question

$10^{2y}$ = 25 , then $10^{-y}$ = ?

Answer 1

${10}^{2y} = 25$

${10}^{2y} = {5}^{2}$

${10}^{ y } = {5}$

${10}^{ - y} = {5}^{ - 1}$

=1/5

Hope it will help you......