1. The graph below has scale 1:1. Use the graph to answer the questions below. [7] a) State one interval where the curve is concave down and one where it's concave up. [2] b) State one point of inection. [1] C) f(x)= [1] d) State the sign or value, if it can be determined for the following. [3] f '(-4) = _ f'(-3) = _ f '(0-5) = _ f"(-4) = _ f"(0) = _ f"(0-5) = _