To simplify the expression \( x^3(2 + y^5) \), we can distribute \( x^3 \) across the terms inside the parentheses.
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Distributing \( x^3 \) gives: \[ x^3 \cdot 2 + x^3 \cdot y^5 \]
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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.