The revenue and cost functions, both in dollars, for the production and sale of x TVs are given as R(x) = 120x - 0.2x2 and C(x) = 3,280 + 13x, respectively. (a) Find the value(s) of x where the graph of R(x) has answer does not exist, enter DNE.) horizontal tangent line with correct units. (Enter your answers as a comma-separated list. Round your answers to the nearest integer. If an X = ---Select--- (b) Find the profit function in terms of x. (Note: Profit is revenue minus costs.) P(x) = (c) Find the value(s) of x where the graph of P(x) has a horizontal tangent line with correct units. (Enter your answers as a comma-separated list. Round your answers to the nearest integer. If an answer does not exist, enter DNE.) --Select--

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