A gym allows members to attend two free strength-building classes each month as part of their $40 monthly membership fee. If they want to attend additional classes during the month they must pay for each additional class they attend. The table below is shows the total amount of money the member will pay at the gym for each additional strength-building class they attend. What is the slope of the line that models this situation?

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.