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2. Find the points on the curve 5:"? COSX that have a horizontal tangent line. 3. The revenue of McMenamy's Fish Shanty located at a popular summer resort is approximately: Ritl=2(54 035%!)03512 during the fth week 0:1 corresponds to the first week of June), where R is measured in thousands of dollars. On what week is the marginal revenue zero? 4. The revenue in thousands of dollars received from the sale of electronic fans is seasonal, with maximum revenue in the summer. Let the revenue received from the sales of fans be approximated by: RIX}= lUOcoleanlZD where x is time in years, measured from January 1. Calculate the marginal revenue for September 1. (Take that one month represents 1/ 12 of the year). 5. Sales of large kitchen appliances such as ovens and fridges are usually subject to seasonal fluctuations. Everything Kitchen's sales of fridge models from the beginning of 2001 to the end of 2002 can be approximated by . 1 . Slx:=sm 10 n I 1 | +1|)+ 2 X .. 2