Let C(x)=x³/3 -7x²+49x + 400 be the total cost, in dolar, of the quantity x produced of a certain product, mark the incorrect alternative a) This total cost function is always increasing. b) The 8 piece will cost the company $ 514.67. c) A good approximation of the cost value of the 6" part is USD 4.00. d) The graph of this function is concave down to x = 7. e) The exact cost of the 10 piece is $ 6.33

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