Really,

Simple Calculator Calculation
If the radicand is even is the answer. Hope this helped could I possibly get brainliest?
Unsure of what you mean by "reference number."
I do recognize that 11pi/9 is in quadrant III. I suspect that the so-called "reference number" is the acute angle between the end ray of 11pi/9 and pi, or, in more easily comparable numbers, between 9pi/9 and 11pi/9.
That difference is 2pi/9.
I would say line t !!
it goes through both lines not just one.
Answer:
t=-3
Step-by-step explanation:
Divide 6 from -18
-18÷6=-3
t=-3