1. The problem is to simplify the expression involving terms with $x$. 2. The expressions given are $3(5x)$, $3x$, $3x + 5x$, and $5x$. 3. Simplify each expression: - $3(5x) = 3 \times 5x = 15x$ - $3x$ remains $3x$ - $3x + 5x = (3 + 5)x = 8x$ - $5x$ remains $5x$ 4. The simplified forms are $15x$, $3x$, $8x$, and $5x$ respectively. Final answer: $15x$, $3x$, $8x$, $5x$