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