Mathematics, 23.10.2019 19:00, ack12

Each year, the department of water works measures the chloride concentration level in the water. the first year, they found the chloride concentration changed by -13/5 mg /l . it is estimated that the chloride concentration will change -21/15 mg/l the next year. what is the total change that will likely occur in 2 years?

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Each year, the department of water works measures the chloride concentration level in the water. the...