Ricky answered 90% of the questions on his science test correctly. There were 50 questions on the test. How many questions did Ricky answer correctly?

The table respent two linear functions the equation respented by the first tables is given

1foot = 12 inches; 1 yard = 3 feet

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?