What is the coordinate of the intersection of the unit circle and an angle measuring
Pi/2 radians pls i need a good explanation

Volume of a cylinder with a radius of 13 in and height of 30 in

Factor this polynomial completely x^2-64

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.