To find the total sales of both Stephanie and Robert this week, we consider their individual pretzel sales and the additional pretzels Robert sold.
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Stephanie's Sales: She sells 12 pretzels per hour. If she worked for \( S \) hours, her total sales would be \( 12S \).
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Robert's Sales: He sells 15 pretzels per hour. If he worked for \( R \) hours, his total sales from selling pretzels would be \( 15R \). Additionally, he sold 18 extra pretzels this week, making his total sales \( 15R + 18 \).
Thus, the total sales of both Stephanie and Robert combined can be expressed as:
\[ \text{Total Sales} = \text{Stephanie's Sales} + \text{Robert's Sales} \] \[ \text{Total Sales} = 12S + (15R + 18) \] \[ \text{Total Sales} = 12S + 15R + 18 \]
Therefore, the correct expression that represents the total sales of both people this week is:
A. \( 12S + 15R + 18 \)