8) Use the graph of f' to answer the following questions. Take note of the graph you are given and the function(s) you are asked about. a) Identify all the critical numbers of f. b) Use the graph of f' to create a sign chart for 1\". Make sure your sign chart is clear for me to read. 0) Based on your sign chart. give the intervals where f is increasing and decreasing. f is increasing on: f is decreasing on: d) Approximate the interva|(s) where f is concave up