(a) Let f(x) = √√3x + 1. Use the definition of derivative to differentiate f(x), and then find the tangent line to the graph of y = f(x) at x = 4. (5 marks) (b) Consider the function f(x) = 4x5 - 4x³.

(i) Find the x-intercepts and y-intercepts. (2 marks)

(ii) Find the intervals over which the function f(x) is increasing and the intervals on which it is

decreasing. (3 marks)

(iii) Find local minimum/maximum points. (3 marks)

(iv) Find the intervals over which the function f(x) is concave upwards and the intervals on which it is concave downwards. (3 marks)

(v) Determine the points of inflection of f(x). (2 marks)

(vi) Sketch f(x) showing all intercepts, turning points and points of inflection. (2 marks)

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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