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Charles owns a watch repair shop.He has found that the cost of operating his shop is given by the quadratic function C(x) = 4x 2

Charles owns a watch repair shop.He has found that the cost of operating his shop is given by the quadratic function C(x) = 4x2 -368x + 53 where c is cost and x is the number of watches repaired.How many watches must he repair to have the lowest cost?

To have the lowest cost, Charles must repair

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