Olby and Sarah sold newspapers this past summer. Colby earned $4.50 for each newspaper he sold. Sarah's earnings were $35 less than Colby's at the end of the summer. The following expression shows Sarah's earnings:
4.50y - 35
In the expression, what does the variable y represent?
Sarah's earnings at the end of the summer
Colby's earnings at the end of the summer
The number of newspapers that Sarah sold
The number of newspapers that Colby sold
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