Complete the equation of the line through (−6,5)(−3,−3)

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?

When y’all answer can y’all explain too !

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show