2. For the table below, calculate: [4 marks] a) the first differences. What conclusion can you make based on your results? b) the ratio of the first differences. What conclusion can you make based on your results now? $ Ay Ratio 500 525 A W N - 551.25 578.81 607.75 3. Suppose that a new drug follows the model M = M. (0.79) , where M is the mass of drug remaining in the body, M. is the mass of the dose initially taken, in milligrams, and t is the time in hours since the dose was taken. A standard dose is 100 mg. How much mass of the drug will remain in the body at 48 hours if 100 mg was taken initially? [ 2 marks] 4. In 1626 Toronto Island was sold for $24. If that money had been invested at 4 % per annum compounded annually, what would it have amounted to in 2008? [3 marks] 5. The town of Springfield is growing at a rate of 6.5% per annum. How many people are there in Springfield now, if there will be 15 000 in 4.5 years? [3 marks] Page +