Answer:
This would be the commutative property because in either order the sum will always be the same.
You were asking about the property type, right?
The cotangent function is defined as the ratio between cosine and sine of a given angle, i.e.

Since you can't have zero at the denominator, the cotangent function is not defined when the sine is zero.
Let's look at your option:
, so the cotangent is defined here
, so the cotangent is not defined here
, so the cotangent is defined here
, so the cotangent is defined here
Answer:
787.4016 inches
Step-by-step explanation:
-10/8 and + 15/8. Those should work.