To determine the total cost \( C \) for an order of \( x \) ink cartridges, you can consider both the cost of the ink cartridges and the flat shipping fee.
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The cost for \( x \) ink cartridges, each priced at $19, is represented as: \[ 19x \]
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The flat shipping fee is $7.50, which remains constant regardless of the number of cartridges purchased.
Now, combining both costs, the total cost \( C \) can be expressed algebraically as: \[ C = 19x + 7.50 \]
This expression represents the total cost for ordering \( x \) ink cartridges including the shipping fee.