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you purchase 12 packages of wrapping paper. large packages cost $7 & small cost $4.50. Write & simplify an expression that represents the total cost if n of the 12 packages are large

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N Large packages.
(12-N) Small packages.

Cost = 7n + 4.5(12-n)
Cost = 7n + 54-4.5n = 2.5n + 54.

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