1. The problem is to simplify the expression $(Kk)^3$. 2. The rule for exponents states that when raising a product to a power, you raise each factor to that power: $ (ab)^n = a^n b^n $. 3. Applying this rule, we get: $$ (Kk)^3 = K^3 \cdot k^3 $$ 4. This is the simplified form of the expression. 5. So, the final answer is: $$ K^3 k^3 $$