Please help me on this math question i'll mark you brainiest if you answer

The Answer to the question is B) -1

Step-by-step explanation:

3 + 2n = 2(-8 - 6n) - 5n

    3 + 2n  = -16 - 12n - 5n

        3 + 2n   =   -16 -17n

            - 2n               - 2n

3 = -16 -19n

+16  +16

19 = -19n

-19    -19  

n =  -1

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees