For every left handed person, there are about 4 right-handed people. if there are 30 students in a class, predict the number of students who are right-handed

Barrett is comparing the membership fees for two museums. the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?