Cost of communication 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about interpreting a line graph The graph below shows the setting-up costs for three different types of communication links. Costs over distance of different types of Communication links Question a) Which would be the most expensive link to use for a distance of 2 km? Radio link Copper cable link Fibre optic cable link Question 1Change answer b) How much would it cost to set up a radio link for 1.5 km? $ Question 2Change answer c) Estimate what it would cost to set up a fibre optic link over a distance of 1 km. $ Question 3Change answer d) Up to what distance is it cheaper to use copper cable links rather than radio links? km Question 4Change answer e) Make a general statement comparing the cost of fibre optic and copper cable links. e) Make a general statement comparing the cost of fibre optic and copper cable links. Task administration: This task is completed with pencil and paper or online with some auto-marking. Level: 5 Curriculum info: Maths, Number and Algebra, Patterns and relationships Keywords: graph interpretation, breakeven points, linear equations, simultaneous equations Description of task: Students interpret a line graph of a practical situation. Learning Progression FrameworksThis resource can provide evidence of learning associated with Using symbols and expressions to think mathematically, sets 6-7 within the Mathematics Learning Progressions Frameworks.Read more about the Learning Progressions Frameworks. Answers/responses: Y10 (10/1998) a) Fibre optic cable. very easy b) 40 000 easy c) 78 000 [Accept in range $75 000-$80 000]. easy d) Accept answer between 0.55-0.70. moderate e) For any 1 of: Fibre optic cables are always more expensive than copper (or copper are always cheaper than fibre optic). Fibre optic cables are about $12 000 (range $12 000-$20 000) more than copper cables. Fibre optic cable increases in price faster than copper cable link. Other acceptable answers. easy Diagnostic and formative information: Student response Likely calculation b) c) 40 80 Ignores ($'000s) on y-axis label. d) .5 Inaccurate reading of x-axis. Which taxi company? Internet cost Rescue helicopters Washing machine repair Car maintenance