Question

Question in image ,it's the circle marked

Answer 1

1:

$\log_{10}(x) = a \\ x = 10^{a} \\ \frac{x}{10} = \frac{10 ^{a} }{10} \\ \\ \boxed{ \frac{x}{10} = 10 ^{a - 1} }$

2:

$\log_{10}(y) = b \\ y = 10 ^{b} \\ {y}^{2} = ( {10}^{b} )^{2} \\ \\ \boxed{{y}^{2} = {10}^{2b} }$