The table shows how a 3-acre piece of land is split into 5 lots. how many acres are in lot 5?

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 expression is equivalent to 42x-56y

Math it's appreciated. (picture provided)