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The temperature of a cup of coffee tminutes after it has been poured is described by the function C (t) = 20 + 65 (0.92)'

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The temperature of a cup of coffee tminutes after it has been poured is described by the function C (t) = 20 + 65 (0.92)' . How many minutes does it take for the coffee to cool to a temperature of k degrees? For what values of [C does your formula make sense

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