6. 11 contestants are waiting in a group to take a
picture with Dua Lipa. Only 4 contestants can be
selected randomly. How many different orders of
contestants' pictures could happen?
a. 7,920
b. 11!
c. 55,440 nett
d. 110
e. 990

Plz help because I'm confused

Which of the following is a justification used while proving the similarity of triangles lom and mon

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

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.