Moving at a constant rate, a race car travels 242 miles in 2 hours and 726 miles in 6 hours. Which equation represents the relationship between the number of hours (x) and the distance the race car travels (y)?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Prove that quadrilateral is a rhombus.

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.