For items 18-19: A manufacturer determines that the cost of producing x units of a particular commodity is C thousands of dollars, where C(x) = 0.04x2 +5.1x +40. 18. What is the average rate of change of the cost as the level of production changes from x=10 to x=11 units? A. $4.98 per unit B. $5.94 per unit C. $ 6.24 per unit D. $ 6.58 per unit 19. Find the instantaneous rate of change of the cost with respect to the production level when x310. Is the cost increasing or decreasing when 10 units are produced? A. increasing at the rate of $5.90 per unit B. decreasing at the rate of $4.90 per unit C. increasing at the rate of $6.20 per unit D. decreasing at the rate of $6.60 per unit

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