Population growth. In 2015, the estimated population of Brazil was 204 million with a relative growth rate of 0.77%. (A) Write an equation that models the population growth in Brazil, let 2015 be year 0. (B) Based on the model, what is the expected population of Brazil in 2030?

The growth model P=208e0.008t describes the population of the United States, in millions, t years after 1970.  When will the population be 500 million? When will it be a billion?

Section 2.2 (81) In the early stages of the deadly SARS (severe acute respiratory syndrome) epidemic in 2003, the number of cases was increasing by about 18% each day. On March 17, 2003 (the first day for which statistics were reported by the World Health Organization), there were 167 cases. Find an exponential model that predicts the number of cases "t" days after March 17, 2003, and use it to estimate the number of cases on March 31, 2003. (The actual reported number of cases was .)