One cooy machine can run off copies in 198 minutes. a newer machine can do the same job in 126 minutes. how long does it take the two machines, working together, to make all of the necessary copies?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Jonathan can throw a baseball 10 1/3 yards. his brother joey can throw a baseball 13 1/2 yards. how much father can joey throw the ball?

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {