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OpenStudy (anonymous):
in 1983 the population in a local lake was rated at 1.4 parts per million. by 1985 it had risen to 2.8 parts per million. Which of the following express the rate of change in parts per million per year from 1983 to 1985. a) 9 b) 7/10 c) 1/9 d) 1/2
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