4. Using the vectors provided f5 = [ 1,5,6] {3' = [2,3,1] and f = [3,4, 1], determine a] the area of the parallelogram form by vectors f) and c7 . 9 b] the volume of the parallelepiped formed by the three vectors. 0 c) the angle between (7 and F 9 d) 'pqu' *3 5. For the function f (x) = xzex a] Determine the maximum and minimum point[s). Show your table to identify where the functions is increasing and decreasing b) Determine the point[s) of inection. Show the table to identify the concavity of the function. 9