* 00 Your answer is partially correct. Whooping cough was thought to have been almost wiped out by vaccinations. It is now known that the vaccination wears off, leading to an increase' in the number of cases, w, from 1248 in 1981 to 25,827 in 2004. (a) With t in years since 1980, find an exponential function that fits this data. NOTE: Round numbers to three decimal places if necessary. Number of cases: w = (b) What does your answer to part (a) give as the average annual percent growth rate of the number of cases? NOTE: Round your answer to the nearest percent. The annual percent growth rate is 23 G Search or type URL %24 2 3. 5. 7. 6 R

The following table relates the weight of garbage in tons to the time in years since 1984.  It is known that the relationship is exponential.  Use the table to answer the following questions.  Number of years since 1984 1 3 5 7 9 Weight of garbage (in tons) 2580 3715.2 5349.888 7703.83872 11093.52776 What is the 2-year growth factor?     What is the 1-year percent change?     What was the weight of the garbage in 1982?

Which of the following display exponential growth? Select all that apply. OP = 750(0.995)* OP = 5,000() Population Year Size 2003 1,250 2004 1,375 2005 1,513 2006 1,665 2007 1,832 Number of Population Years Size 850 1 955 2 1,060 3 1,165 4 1,270 Time Population size

A 1987 treaty to protect the ozone (0, 1046) 1100, 1000 layer produced dramatic declines in global production, P, of chlorofluorocarbons (CFCS). 900 800 700 600 (5, 338) 500 400 See figure to the right." 300 Find a formula for P as an 200 100 exponential function of the number 10 15 of years, t, since 1989. Years since 1989 What was the annual percent decay rate? NOTE: Round the numbers in the formula to three decimal places if needed. P(t) -0.226t 1046 e CFC production was decreasing at a rate of % per year during this time period. P (thousand tons)