Suppose that the percentage of the population that is immune to a certain disease is increasing by the same percentage each year. Two years ago, 47% of the population was immune. Currently, 51% of the population is immune.
Write down a formula for the percentage of the population that will be immune t years from now. Show your work!
Use your formula to estimate the percentage that will be immune 10 years from now.
3. If this spread of immunity continues,estimate how many years it will take for 95%of the population to be immune. Use a logarithm, and show your work!
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