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Botany A group of Tasmanian botanists have claimed that a King’s holly shrub, the only one of its species in the world, is also the oldest living plant. Using carbon-14 dating of charcoal found along with fossilized leaf fragments, they arrived at an age of 43,000 years for the plant, whose exact location in southwest Tasmania is being kept a secret. What percent of the original carbon-14 in the charcoal was present? Source: Science.
hay will give contaminated milk. (The tolerance level for radioactive iodine in milk is 0.) The percent of the initial amount of radioactive iodine still present in the hay after/days is approximated by P(t), which is given by the mathematical model
- (a) Find the percent remaining after 4 days.
- (b) Find the percent remaining after 10 days.
- (c) Some scientists feel that the hay is safe after the percent of radioactive iodine has declined to 10% of the original amount. Solve the equation 10 = 100e−0.1t to find the number of days before the hay may be used.
- (d) Other scientists believe that the hay is not safe until the level of radioactive iodine has declined to only 1 % of the original level. Find the number of days that this would take.
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Finite Mathematics and Calculus with Applications (10th Edition)
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