Cual es el valor de b

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

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.