To find the expression that represents the total sales of both Stephanie and Robert this week, we need to consider the number of pretzels each person sold based on the number of hours they worked.
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Stephanie's sales:
- She sells 12 pretzels per hour, and if she worked for \( S \) hours, then the total sales by Stephanie is \( 12S \).
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Robert's sales:
- He sells 15 pretzels per hour, and if he worked for \( R \) hours, then his total sales would be \( 15R \).
- Additionally, Robert sold an extra 18 pretzels this week.
To find the total sales, we add Stephanie's and Robert's sales together:
\[ \text{Total Sales} = \text{Sales by Stephanie} + \text{Sales by Robert} + \text{Additional Sales by Robert} \] \[ \text{Total Sales} = 12S + 15R + 18 \]
So the expression that represents the total sales of both people this week is:
A. \( 12S + 15R + 18 \)