Find the measure of each angle

pls

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

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 of the following describes the symmetry of the graph of y = x3?