The graph of a function
y = f(x)
is shown. at which point(s) are the following true? (select all that apply.)
answer found

(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
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
Point E

(c) Point A

45x is the correct answer