What is the domain of the given function ?

I believe it is a. {x | x = -6, -1, 0, 3}, but I could be wrong.

Step-by-step explanation:

D=121

Step-by-step explanation:

First fin the angles on the inside using the outer angles. Always use 180 as your main number to subtract from. 180-131 = 49  180-108= 72   72+49=121

180-121=59  180-59=121

Or an easier way is to see if your outer angles equal up to 360

So 131+108=239

360-239=121

And there's your solution.