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Mathematics, 08.05.2020 13:57 ChocCole

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1-An iron bar is heated. Its length, , in millimetres can be modelled by a linear function, = + , where is the temperature measured in degrees Celsius (°C). At 150°C the length of the iron bar is 180 mm.
Write down an equation that shows this information.

2-At 210°C the length of the iron bar is 181.5 mm. Hence, find the length of the iron bar at 40°C.

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