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10. ll. 12. Determine two positive numbers whose sum is 16 and whose product is a maximum. 3, 7 8 c. 3,13 ,9 d. 511 a. b. , A rectangle has a perimeter of 640 cm. What dimensions maximize the area of the rectangle? a. 120 cm, 200 cm c. 100 cm, 220 cm b. 180 cm, 140 cm (L 160 cm, 160 cm Suppose the cost, in dollars, of manufacturing x items is approximated by the mction (Xx) - 0.212 + 5x+ 500, for 1 S x S 1000. If the cost of manufacturing one item can be represented by C the function UIx) - %, determine how many items should be manufactured to minimize the unit cost. a. 50 c. 13 b. 1000 d. 500