20) Is the function f(x) = 3x2 - 27 differentiable on the open Yes, the function is differentiable on this interval. interval (2, 4)? No, the function is not differentiable on this interval. 21) Find the derivative of: Oh'(z) = 675 + 18x4 + 6x3 + 6x2 + 18x +6 h(z) = 23 + 3x + 4 (23 + 3x - 2)2 x3 + 3x - 2 Oh'(x) = 18x3 + 6x2 + 18x + 6 (a3 + 3ac - 2)2 Oh'(x) = -18x2 - 18 (x3 + 3x -2)2 6x2 + 6 Oh'(x) = (23 + 3x - 2)2 22) Assume that the population of the United States is always P'(1999) ~ 153.2 increasing and that it is described by the function P'(1999) 0 you conclude about P'(1999)? Nothing can be concluded about P'(1999). None of the above 23) Given that the derivative of - is - 1 22 , find Of' (2 ) = 3 the derivative of f (x) = ~ Of' (2) = 72 O f' ( x ) = 1 3x2 f' (2 ) = -1 3x2 24) Consider the curve f(x) = 41, 0 5 x