What is the interior angle sum of a shape that has 45 sides?

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?

You can find the constant of proportionality by finding the ratio of

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)