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# 4.7 - Blackboard Learning System 9:48 PM Your location...

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3/29/09 9:48 PM Blackboard Learning System Page 1 of 5 http://online.sdccd.edu/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct View Attempt 3 of 5 Title: Problem Set 4.7 Started: March 25, 2009 10:06 PM Submitted: March 25, 2009 11:25 PM Time spent: 01:19:30 Total score: 9/10 = 90% Total score adjusted by 0.0 Maximum possible score: 10 Done 1. Provide an appropriate response. A company is manufacturing a new digital watch and can sell all it manufactures. The cost (in dollars) is given by where the production output in one day is x watches. If production is increasing at per day when production is 375 watches per day, find the rate of increase in cost. Student Response Feedback A. \$75 per day B. \$175 per day C. \$5 per day D. \$10 per day Score: 1/1 2. Provide an appropriate response. Given the revenue and cost functions R = 26x - 0.3x 2 and C = 3x + 10, where x is the daily production, find the rate of change of profit with respect to time when 20 units are produced and the rate of change of production is 7units per day per day.

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4.7 - Blackboard Learning System 9:48 PM Your location...

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