Triangle fit has been reflected over the y-axis. which of the following best describes the relationship between the y-axis and the line connecting f to f′?

they share the same midpoints.
they are diameters of concentric circles.
they are perpendicular to each other.
they are parallel and congruent.

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

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?

For the inequality |c| < |d| to be true, which of the following must be true?