What defining feature makes a material an insulator?

Really need on these. i have no idea what to do

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: .

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.