BD is the perpendicular bisector of ABC, and BD is a shared side of ABD and CBD. Which of the following must be congruent in order to verify that ABD CBD?

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?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Pranza plotted point a in the coordinate plane below.