In the year 1997, the age-adjusted death rate per 100,000 americans for heart disease was 246.9. in the year 1998, the age-adjusted death rate per 100,000 americans for heart disease had changed to 238.6. a) find an exponential model for this data, where t = 0 corresponds to 1997. f ( t ) = b) assuming the model remains accurate, estimate the death rate in 2029. (round to the nearest tenth.)