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The percentage of charge in a mobile phone battery, C%, after hours of use can be modelled by the function C = mt+k. Initially,

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The percentage of charge in a mobile phone battery, C%, after hours of use can be modelled by the function C = mt+k. Initially, the battery is fully charged. The battery life is 12.5 hours. a i State the value of k ii Calculate the value of m b Determine a suitable domain for the function.

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