Question

please answer it fast fast ​

Answer 1

20

Step-by-step explanation:

angle ABC PLUS angle ABD equals 180 degrees.

therefore, 2n+10 + 8n - 30 = 180.

10n -20 = 180.

10n= 200.

n= 200/10

n= 20

Answer 2

Step-by-step explanation:

Angle ABC + Angle ABD = 180°

2x + 10 + 8x - 30 = 180°

10x - 20 = 180°

10x = 180 + 20

10x = 200

x = 200/10

X = 20