Assuming $j$j and $k$k are non-negative, write the expression $\sqrt{j}\sqrt{k}$√j√k as a single radical.
Assuming $m$m and $n$n are non-negative. write the expression $4\sqrt{m}\cdot2\sqrt{n}$4√m·2√n using a single radical.
Assuming $m$m and $n$n are non-negative, write the expression $\sqrt{5m}\sqrt{5m}\sqrt{n}$√5m√5m√n using a single radical and simplify where possible.
Write the expression $\sqrt{7y}\sqrt{3y^5}$√7y√3y5 in simplest radical form, where $y$y is non-negative.