An office worker is looking out a window W from the top floor of a building standing on level ground. From W, a car C has an angle of depression 2a, while a balloon B directly above the car has an angle of elevation a. The height of the balloon above the car is x, and the height of the window above the ground is h. How do you show that tan 2a/h = tan a/x-h?

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?

If a is a nonzero real number then the reciprocal of a is

Find the missing factor. write your answer inexponential form.9^2=9^4×