To simplify the expression \(\sqrt[10]{(2+5y)^{10}}\), we can use the property of exponents that states \(\sqrt[n]{a^n} = a\) when \(a\) is non-negative. This means that the 10th root of \((2+5y)^{10}\) is simply \(2+5y\).
Step 1: Expression Setup
We start with the expression given in the problem:
\[
\sqrt[10]{(2 + 5y)^{10}}.
\]
Step 2: Apply the Property of Exponents
Using the property of exponents, we know that:
\[
\sqrt[n]{a^n} = a \quad \text{for } a \geq 0.
\]
Thus, we can simplify our expression:
\[
\sqrt[10]{(2 + 5y)^{10}} = 2 + 5y.
\]
Final Answer
The simplified expression is
\[
\boxed{2 + 5y}.
\]