Can y'all answer my question: 3d + 45 = 150

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.

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.