a) Find an equation of the tangent line, at the designated point, to each of the following: i) f(x) = ln(4 + 5x-2x³), x = 0. ii) y2 = 3xy 5, P(2,1). b) Find the x-coordinates of all points on the graph of y = x3 + 2x² - 4x + 5 at which the tangent line is parallel to the line 2y + 8x5 = 0.