Answer in its simplest form 11/6 - 2/3

Which math sentence can be used to determine if the triangle is a right triangle?

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?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)