What is the measure of a? apex

D) 50

Step-by-step explanation:

The sum of the angles of a triangle always add up to 180. That means 100+30+m<A=180 or 130+m<A=180 or m<A=50.

Its D. 50

Step-by-step explanation:

because you already have a 100* and a 30* but you need 180* so when you add 50* it goes up to 180*.

Hope this helped you! :3

(if right make this the brainliest please)

yes. we do proportions in probabilities.