There are 60 seconds in a minute and 60 minutes in an hour. How many seconds are in one hour? *

Which expression is equivalent to 2x^2+7x+4?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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.