A dairy is planning to introduce and promote a new line of organic ice cream After test marketing the new line in a large city the marketing research department found that the demand in that city is given approximately by the following equation where x thousand quarts were sold per week at a price of Sp each and whose revenue function is given as R x xp p 15 0 x 6 A Find the local extrema for the revenue function 8 On which intervals is the graph of the revenue function concave upward Concave downward A What is are the local maximum a Select the correct choice below and if necessary fill in the answer box to complete your choice OA The local maximum a is are at x Simplify your answer Use a comma to separate answers as needed OB There is no local maximum What is are the local minimumva Select the correct choice below and if necessary fill in the answer box to completeur choice OA The local minimum a is are at x Simplify your answer Use a comma to separate answer OB There is no local minimum swers as needed B On which intervals is the graph of the revenue function concave upward Select the correct choice below and if necessary fill in the answer box to complete your choice OA The graph is concave upward on