Chapter 12 - Exponential Functions and Logarithmic Functions - 12.4 Properties of Logarithmic Functions - 12.4 Exercise Set - Page 810: 20

$\dfrac{1}{2}\log_{10} y$

Using $\log_b x^a=a\log_b x$ (or the logarithm of a power), the given logarithmic equation, $ \log_{10} y^{1/2} ,$ is equivalent to \begin{array}{l}\require{cancel} \dfrac{1}{2}\log_{10} y .\end{array}