Four times a number is 21 more than the number

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.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Alex's monthly take home pay is $2,500. what is the maximum bad debt payment he can maintain without being in credit overload?