How many ways can Elena choose 4 songs from a list of 15 if the order of the songs is important?

Alocal concert promoter purchases 2 3/4 pages of ads. when one of the concerts is cancelled, the promoter cancels 1 5/8 pages of ads. how much advertising space is the concert promoter actually using?

Which of the choices shown could be used to prove that aacp=abcp ?

If f(x)=x+7 and g(x)=1/x what is (fog)(x)