Pl helpsomeone made me get one wrong so I'm gonna fail unless I get this right


A sumo wrestling ring is circular and has a circumference of 4.6pi meters
What is the area A of the sumo wrestling ring in square meters?
Give your answer in terms of \piπpi.

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15

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.