Answer:
The expression becomes;
[tex]216s^{15}t^{18}[/tex]
Explanation:
Simplify the expression;
[tex](6s^5t^6)^3[/tex]
Applying the laws of indices;
Power of power rule;
[tex](a^m)^n=a^{mn}[/tex]
The expression becomes;
[tex]\begin{gathered} (6s^5t^6)^3 \\ =(6)^3(s^5)^3(t^6)^3 \\ =6^3s^{5(3)}t^{6(3)} \\ =6^3s^{15}t^{18} \end{gathered}[/tex]
Therefore, the expression becomes;
[tex]216s^{15}t^{18}[/tex]
