9)What are the dimensions of the base of the rectangular box of greatest volume that can be constructed from 100 sq inches of cardboard if the base is to be twice as long as it is wide. Assume the box has no top.

Taking algebra two apex courses and need with these questions

What is the area of the trapezoid shown ?

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.