For a certain product, cost C and revenue R are given as follows, where x is the number of units sold in hundreds. Cost: c? =x + 90 x + 55 Revenue: 900(x - 6)² + 28R² = 20,412 a. Find the marginal cost - dC at x = 6. dx The marginal cost is estimated to be S (Do not round until the final answer. Then round to the nearest hundredth as needed.)

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