4/6=x/10 solve the proportion

Multiplying an even number of negative numbers gives an answer that is choose from:

Which of the following statement about pascal's triangle are true?

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?