A mining company estimates that the marginal cost of extracting x tons of copper ore from a mine is 0.4 + 0.008x, measured in thousands of dollars per ton. Start-up costs are $150,000. What is the cost of extracting the first 50 tons of copper? $ 150,030 What is the cost of extracting the next 50 tons? $ 50000 Need Help? Read It Watch It The speeds of vehicles on a highway with speed limit 90 km/h are normally distributed with mean 105 km/h and standard deviation 10 km/h. (Round your answers to two decimal places.) (a) What is the probability that a randomly chosen vehicle is traveling at a legal speed? 0.0668 % (b) If police are instructed to ticket motorists driving 110 km/h or more, what percentage of motorist are targeted? 0.31 % The marginal cost of producing x units of a certain product is 77 +1.8x0.004x2 + 0.00004x (in dollars per unit). Find the increase in cost if the production level is raised from 1,800 units to 1,900 units. (Round your answer to the nearest cent.) $ 7,776,000 Need Help? Read It