△ABC is reflected over the x−axis and then reflected over the y−axis to form ΔA''B''C'' as shown below.

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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?

Ihave trouble finding the nth term of a linear sequence