A large plane is able to cruise at 530 miles per hour.
What is the ratio of miles per hour?

Solve: 3x+y=6 4x-2y=18 show all work !

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.