Rex is four times as old as ted. if the sum of their ages is 30, how old is ted?
a: 5
b: 8
c: 10
d: 6

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Ming says that 0.24 > 1/4 because 0.24= 2/4. which best explains mings error

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.