To find the cost of one shirt, you can take the total cost for a specific quantity and divide it by that quantity.
Using the data from the table, for example:
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For 6 shirts at a cost of $18: \[ \text{Cost per shirt} = \frac{18}{6} = 3 \text{ dollars per shirt} \]
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For 5 shirts at a cost of $15: \[ \text{Cost per shirt} = \frac{15}{5} = 3 \text{ dollars per shirt} \]
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For 4 shirts at a cost of $12: \[ \text{Cost per shirt} = \frac{12}{4} = 3 \text{ dollars per shirt} \]
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For 3 shirts at a cost of $9: \[ \text{Cost per shirt} = \frac{9}{3} = 3 \text{ dollars per shirt} \]
In all cases, the cost for one shirt is $3.
Answer: $3