It only has two number sentences because 81 divided by anything else wont work only 9 would. Also since 9 times 9 is equal to 81
Supplementary angles.
This is because supplementary angles are two angles that add up to 180 degrees, and these two angles would add up to 180 degrees.
Answer:

Step-by-step explanation:
If the expression is 'seven less than n', we are subtracting 'seven' from 'n'.
Answer:
I don't get the question?? What is the question??
Step-by-step explanation:
Answer: (4x+12) - (2x-5)
Step-by-step explanation: The (4x+12) is positive and the (2x-5) is negative.