PLEASE HELP: Vavilen inflated a huge balloon in 19 minutes. Then he poked a hole in the balloon so that it slowly leaked air out until it was completely deflated.
The rate at which the air leaked out of the balloon (in liters of air per minute) was half of the rate at which
Vavilen inflated the balloon. It took the balloon 38 minutes to completely deflate.
At what rate did Vavilen inflate the balloon, and at what rate did the balloon deflate?
Choose 1 answer. A, B, C, or D.

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.