The windows of a downtown office building are arranged so that each floor has 6 fewer windows than the floor below it . if the ground floor has 52 windows, how many windows are on the 8th floor ? a. 10 b. 8 c. 4 d. 6

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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.