Workout the size of angle x 79 35

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?

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

If sin(x) = 0 and cos(x) = 1, what is tan(x)?