To simplify the expression \( 8(3x + 3) + 5x \), we start by distributing the 8 across the terms inside the parentheses:
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Distribute \(8\) to \(3x\) and \(3\): \[ 8(3x) + 8(3) = 24x + 24 \]
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Now, add \(5x\) to the result: \[ 24x + 24 + 5x = (24x + 5x) + 24 = 29x + 24 \]
Thus, the expression simplifies to \( 29x + 24 \).
The equivalent algebraic expression is C. \( 29x + 24 \).