First, I should point out that g(x) should be written as g(x)=(x+2)/3, otherwise the problem is confusing.

(A) 
(B) Since
and
, it holds that
for all x. This means the composed functions are *identical*
Exact form: 65/8
Decimal form: 8.125
Mixed Number form: 8 1/8
2 and 8 have fixed places - 2 in the ten-thousands place and and 8 in the ones place (number must be even).
There remaining 3 numbers left can be arranged in

ways.
So, there are 6 different ways.
23 3/4. because if it was 0.25, then you know that it is a quarter, 0.50 is half, therefore 0.75 is three quarters