The marginal cost of manufacturing :7: yards of a certain fabric is C'(.t:) : 3 0.01:1: + 0.0000069:2 (in dollars per yard). Find the increase in cost ifthe production level is raised from 2000 to 6500 yards. Increase in cost = $| I (Round to three decimal places as needed.) A company estimates that its sales will grow continuously at a rate given by the function S'(t) : 1560'\" where S'(t) is the rate at which sales are increasingI in dollars per day, on day t. (A) Find the total accumulated sales for the first 7 days.' ' (B) Find the total accumulated sales from the 2nd day through the 9th day' ' (Round to three decimal places as needed.) A factory produces bicycles at a rate of 85 + 0.4t2 0.9t bicycles per week (tin weeks). How many bicycles were produced from day 8 to 21? Answer:' | 'bicycles. (Note: Round down to the nearest whole number since a factory only produces whole bicycles.) Water flows into an empty reservoir at a rate of 3600 + 15t gal/hour . What is the quantity of water in the reservoir after 12 hours? Answer: gallons