Can someone please help me with this i dont get it

How can you tell when x and y are not directly proportional?

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

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