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Create expressions with parentheses

Problem

Kellan's neighbor went out of town for 9 days.
The table below shows the work she did for her neighbors and how much they paid her for each task.
ChoreAmount
Dog walkingdollar sign, 7
Plant wateringdollar sign, 2
Empty litter boxdollar sign, 3
Kellan performed each task once a day for 9 days.
Which numerical expression shows the total amount of money Kellan earned over the nine days?
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