1. **State the problem:** Simplify the expression $k^{10mn} \cdot k^{4} - k^{8} \cdot mn^{\text{power}}$ (assuming the last term is $mn$ to some power, but since it's unclear, we focus on the first part). 2. **Recall the exponent rules:** When multiplying terms with the same base, add the exponents: $$a^x \cdot a^y = a^{x+y}$$ 3. **Apply the rule to the first part:** $$k^{10mn} \cdot k^{4} = k^{10mn + 4}$$ 4. **The second term is $k^{8} \cdot mn^{\text{power}}$, which cannot be combined with the first term since bases differ.** 5. **Final simplified form:** $$k^{10mn + 4} - k^{8} \cdot mn^{\text{power}}$$ Since the problem statement is ambiguous about the last term's exponent, this is the simplest form based on given information.