Using the graph of f(x) = 8 (2, estimate the derivative of f(x) when x = 4. y 6 5 4 3 2 1 -6 -5 -4 -3 -2 -1 O 3 4 5 6 X -1 -2 -3 4 5 .6\fFor the graph shown below, find all values of x for which f(x) is not differentiable. 6 5 3 2 .6 -5 -4 -3 -1 O 2 3 5 6 X -1 -2 -4 -5The cost function, C(x), in dollars for producing x units is given by C(x) =0.27x2+ 12x + 755. Approximate the cost of producing the 17th unit by using the marginal cost