How many solutions does y=3x+2y=3x−6 have

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?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Charlie tosses five coins.what is the probability that all five coins will land tails up.