$16-{\left( \frac{ 1 }{ 2 } \right)}^{2}$
To raise a fraction to a power, raise the numerator and denominator to that power$16-\frac{ 1 }{ 4 }$
Calculate the difference$\begin{align*}&\frac{ 63 }{ 4 } \\&\begin{array} { l }15 \frac{ 3 }{ 4 },& 15.75\end{array}\end{align*}$