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To simplify the expression \( x^3(2 + y^5) \), we can distribute \( x^3 \) across the terms inside the parentheses.
1. Distributing \( x^3 \) gives:
\[
x^3 \cdot 2 + x^3 \cdot y^5
\]
2. This results in:
\[
2x^3 + x^3y^5
\]
Thus, the equivalent expression is \( 2x^3 + x^3y^5 \).
So, the correct response is:
**2 x cubed plus x cubed y superscript 5.**