7) Find all the points C on the curve f(x) = x-6x+1 which satisfy the conclusion to the Mean Value Theorem on [0,3] (Same hint as in Problem (6)) 8) Let f(x)=x+4x be a given function. Then find a) All the intervals where the graph is increasing or decreasing ? b) The local Extremum points? c) The inflection points? d) The Concavity? e) Sketch the graph? f) The y-intercept? g) The x-intercepts? h) The domain of f(x)? i) The range of f(x)?