Polluted water is passed through a series of filters. Each
Chapter , Problem 4.1.35(choose chapter or problem)
Polluted water is passed through a series of filters. Each filter removes 85% of the remaining impurities. Initially, the untreated water contains impurities at a level of 420 parts per million (ppm). Find a formula for , the remaining level of impurities, after the water has been passed through a series of filters.
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