Me figure out this question number 20 (click on the paperclip to see the question

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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.

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge