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Unformatted text preview: 3. The cost function, in thousands of dollars, of producing x items of a commodity is C ( x ) = x 3 & 6 x 2 + 15 x: (a) (10 points) Find the marginal cost function. (b) (10 points) Find C (100) and explain its meaning. What does it predict? 1 4. (20 points) A 13ft ladder is leaning against a house when its base starts to slide away. By the time the base is 12 ft from the house, the base is moving at the rate of 5 ft/sec. How fast is the top of the ladder sliding down the wall then? 5. (20 points) Use a linear approximation to estimate the given number. (8 : 06) 2 = 3 2...
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 Spring '09
 Nouh
 Economics, Calculus, marginal cost function

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