The expression given in the image is $(6^3)^5$, and we are asked to simplify it to a single power of 6.

Using the power of a power property of exponents, which states that $(a^m)^n = a^{m \cdot n}$, we can simplify the expression.

$(6^3)^5 = 6^{3 \cdot 5} = 6^{15}$

Thus, the simplified expression is $6^{15}$.

Would you like further clarification or details on this? Here are some related questions:

1. How do you simplify an expression with multiple exponents?
2. What is the difference between multiplying powers and raising a power to another power?
3. How would you evaluate $6^{15}$ numerically?
4. Can you explain the general rules for exponentiation?
5. How would this expression change if the base was a variable instead of a number?

Tip: When working with exponents, remember that raising a power to another power means you multiply the exponents.