(0+0.02+0+0.51)1/2 = 0.74.... How do I get to that answer? Well how do I punch the the 1/2?
(0+0.02+0+0.51)1/2
(0+0.02+0+0.51)^(1/2)=
$${\left({\mathtt{0}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0.02}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0.51}}\right)}^{\left({\frac{{\mathtt{1}}}{{\mathtt{2}}}}\right)} = {\mathtt{0.728\: \!010\: \!988\: \!928\: \!051\: \!8}}$$
(0+0.02+0+0.51)1/2
(0+0.02+0+0.51)^(1/2)=
$${\left({\mathtt{0}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0.02}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0.51}}\right)}^{\left({\frac{{\mathtt{1}}}{{\mathtt{2}}}}\right)} = {\mathtt{0.728\: \!010\: \!988\: \!928\: \!051\: \!8}}$$