5.67+42.4561 Now, I need help I dont even know what that means and its extra points!

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?

Find the value of x in each case. give reasons to justify your solutions! d q ∈ pr

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.