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What is the slope of a line that is perpendicular to y = 3x + 1

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at __ link to graph: .

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?