Averge Mercury (mg/L) 1.4 1.2 1.0- 0.8 0.6 0.4 0.2- 0.0 3 5 6 7 Acidity/ pH Level 8 9 a. According to the graph, define the input variable, including units. b. According to the graph, define the output variable, including units. c. Explain the trend in context of the graph. d. Use the equation of the regression line to interpret the rate of change, including units. e. Use the equation of the regression line to calculate the predicted Mercury level with a pH level of 7. Do not round your answer.

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