The engineers use a piecewise linear function to calculate the monthly water charge for its residents. The piecewise linear function, where, C = the cost of the water the number of thousands of litres of water 51 +20, 0≤1≤5 91, 5<<10 101-10, > 10 4) a. Sketch the graph of the function from 1-0 to 1-13 to show the relationship between the litres used and the cost of water. Note: Use appropriate labelling and units. b. Use your graph to determine the monthly water charge if a consumer used, i. 3500L ii. 9000L iii. 12,500L c. Find the equations of each line segment of the graph. (2×3 6 marks)