A 1987 treaty to protect the ozone layer produced dramatic declines in global production, P, of chlorofluorocarbons (CFCS). 1100 (0, 1046) 1000 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 years, t, since 1989. What was the annual percent decay rate? of Years since 1989 NOTE: Round the numbers in the formula to three decimal places if needed. P(t) 1046 e -0.226t CFC production was decreasing at a rate of % per year during this time period. P (thousand tons)

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