The demand function for a textbook is given by p =500 - - where x is the number of textbooks that can be sold at a price of $p per textbook. a. Rewrite the demand function as . Identify the slope and interpret the value. x =f (P) b. Sketch the demand function. c. Find the revenue function R =R(x) d. If each textbook is obtained from a supplier at a cost of $100 per book, find the profit function. e. Find the profit when 600 books are sold. Question 2 Solve the following system of equations: 5r - 2q =30 - 50 - 2q _r+ q 12 4 Question 3 The consumption function is given as follows: _; where consumption (C) and income (Y) are both measured in ringgit. C =f(Y) =0.7Y +5 a. Sketch the consumption function. b. Interpret the numbers "0.7" and "5" in the function. Question 4 The quantity demanded per month of thumb-drives manufactured by Phoenix Industries, is related to the price of thumb-drives. The demand equation is p =- 0.00042x + 6 0