Consider the function f(r) = (r – 1)e. a) When is f(r) = 0, when is f(x) > 0 and when is f(r) < 0? b) Compute the derivative of f. Find all stationary points, and describe when the function f is increasing and when it is decreasing. c) Compute the second derivative of f. Find all inflections points, and when the function f is concave, and when it is convex. d) Provide a sketch of the function, where you include all the important infor- mation that you have computed in point a)-c). (Here you can also write the important information besides the graph if you want).

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