I need help on these 2 Calculus Questions:

WeBWorK 4 - Topics 8 - 9: Problem 7 (1 point) You are given the following graph of the function f (1:) Find the point where the second derivative changes sign from negative to positive? X= .- WeBWorK 4 - Topics 8 - 9: Problem 8 (1 point) Identify the graphs A (blue), B(red) and C (green) as the graphs of a function f (x) and its derivatives f' (x) and f\"(a:). (Clicking on the sketch will give you a version of the picture in a separate window.) ' ? : lis the graph of the function, f(:c) . ? c is the graph of the function's first derivative, f'(a:) . ? c is the graph of the function's second derivative, f\" (11:) . Hint: Remember that f'(.'z:) is itself a function, and we can find the derivative of the function f' (:23), which is called the second derivative of the function f(:1:) and denoted by f\"(a:)