How do you simplify sin(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?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Need showing work for this problem 56.25 ×25.80