Sam's car gets 7 miles per 1/3 gallon of gas. What is Sam's gas mileage per one gallon?

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?

Which of the following is correct interpretation of the expression -4+13

Ill mark the brainliest if you me with the these three questions 7,8,9