What is the slope of the line 4x-2y=15

Given this information, which expression must represent the value of b?

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 use synthetic substitution to tell whether a given binomial is a factor of a polynomial?