Which rule describes a linear relation?

Need solving this second acceleration problem.

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: .

How can you construct perpendicular lines and prove theorems about perpendicular lines