To solve the inequality Suzie wrote, we start with:
\[ 15x + 300 \geq 600 \]
- First, subtract 300 from both sides:
\[ 15x \geq 600 - 300 \]
\[ 15x \geq 300 \]
- Now, divide both sides by 15:
\[ x \geq \frac{300}{15} \]
\[ x \geq 20 \]
Therefore, Suzie needs to make at least \( x \geq 20 \) sales.
The correct response is:
x ≥ 20 (x is greater than or equal to 20)