-18(1) = -18,right?
4(3) = 12, right?
-18 - 12 = -30
From the looks of it, we had to "Subtract" the outcome of each problem that we went over
You're correct: -30 (option A.) would be your answer
I think that it is geometry.
Answer:
There wouldn't be a slope. It would be 0/5
Step-by-step explanation:

6 - 6 = 0
2 + 3 = 5
0/5 isn't a slope.
D has the commutative property because it just flip flopped the numbers.
Answer:
It depends on how many other colors there are
Step-by-step explanation: