Question

.

Answer 1

that would be \[6\sqrt{18}\]
\[\sqrt{18}\] simplifies to \[\sqrt{9*2}\]
so the final anwer is \[18\sqrt{2}\]

Answer 2

same as above

Answer 3

yes. you can multiply radicands provided they have the same index.

Answer 4

\[\sqrt[5]{6}\sqrt[5]{3}=\sqrt[5]{18}\]
observe that the numbers multiplied have the same index which is 5.