Wilson bought gift cards for some lawyers and their assistants. each lawyer got a gift card worth $l. each assistant got a gift card worth $a. there are 14 lawyers. each lawyer has 3 assistants. the expression for the total cost of the gift cards is 14l + 42a. write an expression that is equivalent to the given expression.

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.