SOMEONE HELP ME ! WILL GIVE BRAINLISIT

directions :Use the properties and mental math to solve. Write your answer in simplest form.

( properties : comm and assov)

Me. i can't figure out this question. give an explanation too. .

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Hurry which expression is equivalent to 3√x^5y?