Respuesta :

Answer:

100

Step-by-step explanation:

/_ ABC = /_ ABD + /_ DBC

Given: /_ABC = 130 and /_DBC = 30

* plug in known values *

130 = /_ ABD + 30

Subtract both sides by 30

130 - 30 = 100

30 - 30 cancels out

We're left with /_ABD = 100

nwjohnson1980

Answer:

100°

Step-by-step explanation:

if the entire angle ABC is 130° and angle DBC is 30° (which is part of angle ABC) you subtract the 30° from the entire angle ABC (130°) to get 100° for angle ABD