Problem Suppose y4 - x = y - In(20x). Use implicit differentiation to find an expression for y' . x - 20 (A) y - x(2y - 1) (B) y' = 20 - 2xy - x x (C) y' = x - 1 x(2y - 1 (D) y' = x- 20 x (E)y = 1 (F)y = 1-20 x Problem #7: Select CProblem : The graph of the first derivative f' of a function f is shown in the figure below. y - f ' ( ) 2 O 6 /8 X -2 (a) On what interval(s) is f increasing? (b) On what interval(s) is f concave down? (A) (2, 4), (6,8) (B) (0, 2), (4, 6), (8,9) (C) (0, 2), (4, 6) (D) none (E) (2,4), (6,9) (F) (0,9) (G) (3, 6), (6, 9) (H) (0, 3) Problem #8(a): Select @ 1 Part (a) choices. (A) (3, 6), (6,9) (B) (0, 2), (4, 6) (C) (0, 2), (4, 6), (8,9) (D) (2,4), (6,9) (E) none (F) (2, 4), (6, 8) (G) (0, 9) (H) (0, 3) Problem #8(b): Select @ T Part (b) choices