Please help with the one that are red out in boxes please write answers in boxes.thank you

\f08:00 Thu Jul 14 .. . 29% webwork2.math.umb.edu Consider the function f (a) = - 6+ ex Get Then f' (ac) = ( 6 + ex ) 2 The following questions ask for endpoints of intervals of increase or decrease for the function f (a). Write INF for co, MINF for -oo, and NA (ie. not applicable) if there are no intervals of that type. The interval of increase for f (x) is from - 00 to |0o The interval of decrease for f (x) is from |NA to NA f(x ) has a local minimum at NA . (Put NA if none.) VI f (a) has a local maximum at NA . (Put NA if none.) Get (6- et ) Then f"(ac) = ( 6 + ex ) 3 The following questions ask for endpoints of intervals of upward and downward concavity for the function f (a). Write INF for co, MINF for -oo, and put NA if there are no intervals of that type. The interval of upward concavity for f (a ) is from - 0O to In (6) Tt The interval of downward concavity for f(x) is from In (6) to 0o f (x) has an inflection value, x = In(6) . (Put NA if none.)