What is the length of the line segment whose endpoints are (-1,9) and (7,4) ?

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Are the corresponding angles congruent? explain why or why not.

Which of the following statements must be true about this diagram? check all that apply. x°, y°, z°, & w°