What is 25 percent of 225

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?

What is the area of the triangle 10 13 12

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers