(a) dy/dx is positive when the function is increasing
dy^2/dx^2 is positive when the graph is concave upward
Both are positive at point B
Answer: Point B
(b) dy/dx is negative when the function is decreasing
dy^2/dx^2 is negative when the graph is concave downward
Both are negative at point E
Answer: Point E
(c) Answer: Point A
