Find the value of x(20 question in the photo Answer as soon as possible I need the answer with the steps I will give the brainliest

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

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.

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4