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QUESTION
1)A radioactive substance has a half-life of 277 years. If 1000 g of the substance are present initially, find the amount present after 400 years.
1)A radioactive substance has a half-life of 277 years. If 1000 g of the substance are present initially, find the amount present after 400 years.
2) The population of a certain town was 100,000 in 1990 and 82,500 in 2000 due to the closing of many manufacturing companies.
a) If this is true, what is the annual rate of population decay assuming that the population decays exponentially?
b)What should the population be in the year 2020?
