Consider the following function, where R is the revenue (in thousands of dollars) and x is the advertising cost (in thousands of dollars). 5x3 + 5x? + 2, Osx 5 5 R = - Find R'(x) and R"(x). R'(x) = R"(x) = Find the point of diminishing returns for the function, where R is the revenue (in thousands of dollars) and x is the advertising cost (in thousands of dollars). Use a graphing utility to verify your results. (x, R) =

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