Select the statement that correctly describes the solution to this system of equations. 3x y = -2 x - 2y = 4 A. There is no solution. B. There are infinitely many solutions. C. There is exactly one solution at (-2, -4). D. There is exactly one solution at (0, -2). Put a number into each box to create an equation that has exactly one real solution. 4x 3= (x ( b. Put a number into each box to create an equation that has no real solution. 4x 3= () x + () C. Put a number into each box to create an equation that has an infinite number of solution.

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.