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Unformatted text preview: x years. 20. The population in Detriot, Michigan is decaying at annual rate of 2.5% each year. Detroits current population is 2.3 million people. a. Write an equation of the form y = ab x for the population in the after x years. b. How many years will it take for the population to be half its current population? Explain how you arrived at your answer. c. Write an equation of the form y = a (1/2) x/h for the population in Detroit after x years. 21. The table below gives the amount of money spent on Health Care per person in the US. Year 1960 1965 1970 1975 1980 1985 1990 Health care expenditure $143 $204 $346 $592 $1064 $1701 $2601 a) Find the average growth rate for the health care expenditures. b) Write an equation that models this data what do the variables represent? c) Use your equation to estimate the Health Care expenditure for the following years: a) 2000 b) 2012...
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