Yes,the function g is one - to - one.

Because each European shoe size corresponds to exactly one U.S. shoe size.

Yes,each European shoe size corresponds to exactly one U.S. shoe size.

The each U.S. shoe size 6 corresponds to exactly European shoe size 38.

So, g(6) = 38.

The value of g(6) = 38.

The each European shoe size 42 corresponds to exactly U.S. shoe size 9.

So, .

The value of .

The function .

The each European shoe size 39 corresponds to exactly U.S. shoe size 7.

Since, then .

The each U.S. shoe size 7 corresponds to exactly European shoe size 39.

Since, then .

The value of .