Which of the following statements does not describe pandemics? a. confined to a specific geographic area b. easily spread to new areas c. highly contagious disease d. the bubonic plague (( answer quickly this is for a quiz. and you in ))

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?

If a is a nonzero real number then the reciprocal of a is

Find the missing factor. write your answer inexponential form.9^2=9^4×