\[\sqrt{9 + a}\]
\[a = 0,9:\]
\[\sqrt{9 + 0,9} = \sqrt{9,9} \approx 3,15.\]
\[a = 4,5:\ \ \ \ \]
\[\sqrt{9 + 4,5} = \sqrt{13,5} \approx 3,67.\]
\[a = 29,1:\]
\[\sqrt{9 + 29,1} = \sqrt{38,1} \approx 6,17.\]
\[a = 695,9:\]
\[\sqrt{9 + 695,9} = \sqrt{704,9} \approx 26,55.\]