The commutative property states that you can invert the order of the terms of a sum:

So, if you start with

Applying the commutative property you'll get

12%
40% = 0.4
30 = 0.3
0.3 x 0.4 = 0.12
0.12 = 12%
Answer:
-4 + 5 + 1 is your answer I am the teacher of your Colony
Since the only places where an x-ordinate exist are the closed circles, the domain will simply be:
D: { -5, -4, -3, 1, 2, 5 }