The function f(x) = 3 + 5x + 45x has one local minimum and one local maximum. This function has a local maximum at I = with value This function has a local minimum at I = with value Find the critical numbers of the function f(x) = 12x* + 15x* - 80x* -9 and classify them. Round your answers to three decimal places. T. is a Select an answer is a Select an answer is a Select an answer Given C(E) = 4 - 20x* + 112x a. Find C' (I) = b. Find all critical value(s) of C(I). Separate multiple answers with a comma. T= c. Use interval notation to identify where C(x) is Increasing Decreasing