What are the values of sin α and tan α, if α is an acute angle in a right triangle: cosα= 5/13

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?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?