You need a 45% alcohol solution. On hand, you have a 270 mL of a 55% alcohol mixture. How much pure water will you need to add to obtain the desired solution?

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Which expression is not a polynomial?

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.