Consider the function 8 ex f(x) = 8+ exc Then f'(x) = The following questions ask for endpoints of intervals of increase or decrease for the function f(x). Write INF for , MINF for -, and NA (ie. not applicable) if there are no intervals of that type. The interval of increase for f(x) is from to The interval of decrease for f(x) is from to f(x) has a local minimum at f(x) has a local maximum at Then f"(x) = . (Put NA if none.) (Put NA if none.) The following questions ask for endpoints of intervals of upward and downward concavity for the function f(x). Write INF for , MINF for -, and put NA if there are no intervals of that type. The interval of upward concavity for f(x) is from to The interval of downward concavity for f(x) is from to f(x) has an inflection value, x = (Put NA if none.)