i will mark you brainliest

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?

Aline that intersects one of two parallel lines intersects the other also always sometimes never

Select the two binomials that are factors of this trinomial x^20 - x - 20