Q4. Part of the graph of the function f(x) =2x -Ilx +12x is shown below. (a) Write down the x-intercepts of the curve y = f(x). (b) Find the range of the function if the domain is restricted to the interval I S x $4. (i) the interval -I Sx $4. (c) Solve the inequality 2x' +12x SILx'. Q5. Let f(x) =- 10 3x- 6 (a) Write down the domain and the range of the function. (b) Find the inverse function S". Q6. The line L, passes through the points A(4,-3) and B(7,9). (a) Find the equation of the line , in the form y = mx+ c (b) The line L, is perpendicular to the line , and passes through A. Find the equation of the line L, in the form ax + by +d =0 where a,b,d are positive integers