Clockwork768 Clockwork768

04-10-2017
Mathematics

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The price of 9-volt batteries is increasing according to the function below, where t is years after January 1, 1980. During what year will the price reach $5.00

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spreadlight10 spreadlight10

04-10-2017

5/1.1= e^0.047t so 1/0.047*ln(5/1.1)=t=32.22 years (in2012)

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