You earn 15n15n dollars for mowing nn lawns. how much do you earn for mowing one lawn? seven lawns?

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?

Ahighway between points a and b has been closed for repairs. an alternative route between there two locations is to travel between a and c and then from c to b what is the value of y and what is the total distance from a to c to b?

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?