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26) Exponential Growth: The world population P (in billions) was 6.4 in 2005. The exponential growth rate R was 1.2% per year. Find the exponential growth function for the population (P = Poe", k > 0). Find the world population in 2008. When will the world population be 8 billion? 9 billion? Find the time for the world population to double in size. 9-957!" 27) Radioactive Decay: Let (1 represent a mass of carbon 14 {in grams} whose half-life is 5,730 t years. The quantity of carbon 14 present after t years is given by the model Q = Q0 (35m a. Determine the initial quantity. b. Determine the quantity present after 5,730 years. c. Determine the quantity present after 40,110 years. 28) Radioactive Decay: The initial quantity present of carbon 14 is 800 grams. If this substance has a half-life of 5,730 years, a. Find the formula for the quantity present (Q = Que"). b. Find the amount of substance present after 150 years