The graph at right shows
Over what interval(s) is
concave up? is concave up when is positive. Where is the given graph positive?
This is asking for the slope of the given graph at
-value(s) does have a point of inflection?
This is where
changes sign. Where does the given graph change from negative to positive and vice versa?
-value(s) does have a minimum value? has a minimum where its slope changes from negative to positive.
The slope of
is . So where does change from negative to positive?