Tom took a trip of 1,020 miles. he traveled by train at 55 miles an hour and the same number of hours by plane at 285 mph. how many hours did the trip take?

3 hours
6 hours
8 hours

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?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?