Use the graph of fo) below to estimate the value of f (-2): of (x) (4 points) O -1 Oo O1 O 4For what values of x is the graph of y = 3 concave upward? (4 points) 6-X O No values of x X 4 6 O X >-6 O X > 6At what value(s) of x does for = x* - 8x have a critical point where the graph changes from decreasing to increasing?(4 points) O o and-2 only O 0 and 2 only O o only -2, and 2 only