The first two photos are part A and the last photo is part B!!!

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?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

What is the solution to the equation below? 3/x-2+6=square root x-2 +8