For how many two-digit positive integers does the product of the digits come out to 12?

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 you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

20 ! brainliest ! add and simplify your answer.