1. The half-life of a radioactive substance is the time it takes for half of the substance to decay. The radioactive iodine isotope l-131, which has a half-life of 8 days, is used to treat hyperthyroidism. Solve 400 - 3.125 to find how many days t it will take for 400 millicuries of l-131 to decay to 3.125 millicuries. A 56 days B 7 days C s days D 128 days 2. In the year 2000, the population of Mexico was about 100 million, and was growing by approximately 1.53% per year. At this growth rate, the function f(x) – 100(1.0153)“ gives the population, in millions, x years after 2000. Using this model and a graph of the function, in what year would the population reach 109 million? Round your answer to the nearest year. A 2006 в 2008 c 2005 D 2007 3. Use a graph to solve 3* - 100. A x-4.2 X-2.1 Cx-0.2 D x-0.1

1. The half-life of a radioactive substance is the time it takes for half of the substance to decay. The radioactive iodine isotope l-131, which has a half-life of 8 days, is used to treat hyperthyroidism. Solve 400 - 3.125 to find how many days t it will take for 400 millicuries of l-131 to decay to 3.125 millicuries. A 56 days B 7 days C s days D 128 days 2. In the year 2000, the population of Mexico was about 100 million, and was growing by approximately 1.53% per year. At this growth rate, the function f(x) – 100(1.0153)“ gives the population, in millions, x years after 2000. Using this model and a graph of the function, in what year would the population reach 109 million? Round your answer to the nearest year. A 2006 в 2008 c 2005 D 2007 3. Use a graph to solve 3* - 100. A x-4.2 X-2.1 Cx-0.2 D x-0.1