7. (10 points) Sketch the graph of a twice-differentiable function with the followin properties. Label coordinates where possible. X f(x ) f' (x ) f" ( x) x 0 x = 2 f(x) =0 f'(x) =0 f"(x) >0 2 0 f" ( x ) >0 x = 4 f(x) = 3 f'(x) > 0 f"(x)=0 4 0 f" ( x ) 6 f' ( x )