I need 16 and 18 urgently plz

16 a Find the y-intercept of the tangent to f(x) = x In at the point where: ix=1 ii x = 2 iii x = 3. b Make a conjecture about the y-intercept of the tangent to f(x) = alna at the point where x = a, a > 0. c Prove your conjecture algebraically. 17 Find the axes intercepts of the tangent to y = er at a = 1. 18 Find the exact area of the shaded triangle. ya y = 3xe