Question: Persistent organic pollutants (POPS) are a serious environmental hazard. Figure 1.80 shows their natural decay over time in human fat. (a) How long does it

Persistent organic pollutants (POPS) are a serious environmental hazard. Figure 1.80 shows their natural decay over time in human fat.

(a) How long does it take for the concentration to decrease from 100 units to 50 units? 

(b) How long does it take for the concentration to decrease from 50 units to 25 units? 

(c) Explain why your answers to parts (a) and (b) suggest that the decay may be exponential. 

(d) Find an exponential function that models concentration, C, as a function of t, the number of years

since 1970. concentration units 100 75 50 25 1970 1975 1980 1985

since 1970. concentration units 100 75 50 25 1970 1975 1980 1985 1990 1995 2000 Figure 1.80 year

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