X3•x6•x7

To simplify the expression \(x^3 \cdot x^6 \cdot x^7\), you can use the property of exponents that states when you multiply like bases, you add their exponents.

So, you can calculate:

\[ x^3 \cdot x^6 \cdot x^7 = x^{3 + 6 + 7} = x^{16} \]

Thus, the simplified form of the expression is:

\[ x^{16} \]