Okay. When simplifying square roots, you basically want to look for squared factors in the radicand. Each pair of twin factors in the radicand becomes a single factor "out in front". With practice, you'll take short-cuts.
\(\displaystyle \sqrt{5^2 \cdot t^2 \cdot t^2 \cdot t^2 \cdot t^2 \cdot t^2 \cdot t} = 5 \cdot t \cdot t \cdot t \cdot t \cdot t \cdot \sqrt{t}\)
If you use Windows, the character map has some mathematical symbols:
?(25t^11)
I used LaTex commands above. Click the quote button on any post containing LaTex, to see the commands.