so we need to solve:
[tex]4\sqrt[]{16}+\sqrt[]{25}[/tex][tex]\begin{gathered} \sqrt[]{16}=4 \\ \sqrt[]{25}=5 \\ 4\sqrt[]{16}=4\cdot4=16 \end{gathered}[/tex]so:
[tex]\begin{gathered} 4\sqrt[]{16}+\sqrt[]{25} \\ 16+5=21 \end{gathered}[/tex]so the answer is: 21
and 21 is a rational number, can be written as the ratio of two integers and its decimal expansion does terminate
