Barrett and Penelope have some quarters for the vending machine. The number of quarters Barrett has can be represented by x
. The number of quarters Penelope has is double the number of quarters Barrett has
The total number of quarters they have is 60
What is x, the number of quarters Barrett has?

Which property is illustrated by the statement given below? raj raj.

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

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.