Can someone help me make a residual plot for this?

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

What is the y-intercept of the line given by the equation

The reflexive property of congruence lets you say that ∠pqr ≅