please help me solve this as quick as possible

Access Duty Last call was 5 minutes ago Calibri 11 + BIU A GRAY 1213 1 4 1.5 1 6 1 7 8 1 9 1 10 |11 1 12 1 13 1 14 1 15 | 16 7. The profit function for a new product is given by P(x) = -4x' + 28x -40, where x is the number sold , in thousands. How many items must be sold for the company to break even? (4 marks) 8. Calculate the values of k such that / (x) = 3x- + 4x + k has one zero, no zeros and two zeros. (9 marks) 9. A bus company has 4000 passengers daily, each paying a fare of $2. For each so.15 increase, the company estimates that it will lose 40 passengers per day. (8 marks) a) For maximum profit, how many increases to fare should be made? b) If the company needs to take in $10450 per day to stay in business, what fare should be charged? 10. Determine the point(s) of intersection of the linear function g(x) = -3x + 4 and the quadratic function / (x) = 2x/ + 4x - 11. (5 marks) Thinking ( / 11 marks) 11. Jackie mows a strip of uniform width around her 25m by 15m rectangular lawn and leaves a patch of lawn that is 60% of the original area. What is the width of the strip? (6 marks) 13. Complete the square for / (x) = 3x2 + bx - 7